I decided to make a list of all of the repos that are not currently tracked by repo.sc so that people who wanted to know what they might be missing will have a good list of the additional repos they may need to add to Installer if there's anything else they want that can't be found here.

NOTE:
Repos highlighted in orange may contain copyrighted material (ROMs, BIOS, some eBooks, iPhone apps, etc.) and/or cracks (1.1.3 iPhone Apps crack) so use your discretion.

Repos highlighted in red contain adult material.

[=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=]

Application and General Repos
Ma3rpyr0's Source: mast3rpyr0.hopto.org/repo (To be tracked when XML fixed)
Packages: Term-vt100

Conceited Software Beta: conceitedsoftware.com/iphone/beta
Packges: Twitterific

TouchRepo Beta: touchrepo.com/betarepo.xml
Packages: Rockfall, Waves

iSwitcher: meachware.com/list.xml
Packages: iSwitcher, Themes

Alohasoft: homepage.mac.com/reinholdpenner/
Packages: iPhone Unlocker (Add "102.xml", "111.xml" and "112.xml" to the end of the URL for specific firmware repos)

bHockey720's Repo: bhockey720.googlepages.com/repo.xml
Packages: Gameboy Advance BIOS and games

Cassia: cassia.us
Packages: Cassia Chess

CodeGenocide: repo.codegenocide.com
Packages: iSteamy demo

iPod Touch Master's Repo: ipodtouchmaster.com/files/repo.xml
Packages: iPhone 1.1.3 Jailbreak, iPhone Apps

iPod Touch Master's Repo (Mirror): madpike05.googlepages.com/repo.xml
Packages: iPhone 1.1.3 Jailbreak, iPhone Apps

Mateo: bblk.net/iphone
Packages: Beat Phone

NextHaus: nexthaus.com/iphone/ota
Packages: SyncJE for Contacts

Patrick's Sources: sources.st3alth.org/sources.xml
Packages: Dev tools

Pyrofer's Projects: pyrofersprojects.com/repos/repos.xml
Packages: Random number generator, Flip a Coin, Sand Game, Garf

PXL Repository: pxl.freemyiphone.com
Packages: Mobile Enhancer, TrueMove, AIS, iPhone Utilities, Thai for the Touch

Oscar's 1.1.3 iPhone Apps Repo: oscarwu1991.googlepages.com/iphoneapps.xml
Packages: 1.1.3 iPhone apps with mail fix

Robota International: iphone.robota.nl
Packages: Screenshot, iSpit, SysInfo, TouchLayer, Accelerometer Log, Guitar Tuner, Chess, Touch Layer Test

Shai's repo: ride4.org/shai.xml
Packages: Mario theme icons, AFP, iToggle, Sources, Customize add-ons

Shopping List: mazinger.cs.yale.edu/iphone-apps/index.xml
Packages: Shopping list app

Soneso Repository: soneso.com/iphone
Packages: IP Log, various apps

Swell: lyndellwiggins.com/installer/Swell
Packages: Stacks, Squidge, NES ROMs, Widgets, Surge source

Vladimir Kofman: iphone.vladimirkofman.com/
Packages: Measurement tool

Wisdom on Wheels: wizdomonwheels.com/apps/iphone
Packages: Various web apps


Skin/Theme/Icon/Wallpaper repos
Death to Design: deathtodesign.com/index.xml
Packages: SummerBoard themes

Imagine09: home.twcny.rr.com/imagine09/Imagine09.xml
Packages: SummerBoard themes

iPhone Surge: iphonesurge.com/installer.xml
Packages: SummerBoard and Customize themes

Asuraku's Repo: asuraku.googlepages.com/repo.xml
Packages: Summerboard themes & wallpapers


Localization
Arabic: apps.iphoneislam.com
aXP: lostsoul.aeroxp.org/iphone/index.xml (German Apps)
Belgium: rep.belgium-iphone.com
Chinese: iphone.freecoder.org/rep/
Danish: iphone.vildmedmac.dk/install
FrenchIphone: rep.frenchiphone.com
Greek: greek-iphone.com/grloc
Hebrew עברית: ihebrew.net (includes Hebrew Keyboard And Font, Fixes For Calender, SMS, Address Book, Logos For Israeli Phone Carriers, Translation Between Hebrew-English/English-Hebrew, Fix For Israeli Phone Numbers {In Ex. (02)123-4567 instead of (021)234-567})
iRussian и iUkrainian localizations: irussian.com-a.googlepages.com/irussian.xml
Korean: bomijoa.com/iphone or agaat.info/demo
Norwegian - iFon: install.ifon.no
Persian: s.myiphone.ir
Polish iPolish: wakoman.ovh.org/iphone
Português-Brasil (1.1.2): iphonemod.com.br/forum/repo/installer.xml
Russian iPhone по-русски: russianiphone.ru/beta (includes Russian Language For iPod, 2 Russian Fonts, Russian Keyboard, Mobile Enhancer)
Russian Tools (in English): russianiphone.ru/beta/en (includes Mobile Enhancer, Call Data)
Spanish Phyros iPhone-ES: iphone.frickr.es/index.xml
Swedish iFun.se: ifun.se/swe
Turkish: niffob.com/triphone.xml
Thai: pradt.net/iphone
Vietnamese: iphone.billydragon.net

If I have made any mistakes here or you have anything to add to this list, please let me know.

Nice list! Thank you!
But, actually, a few small notes (in no particular order):
We have someoneguy's book one ( drinkmalk.com/books/index.xml ).
We have Crazyloof's repo ( crazyloof.googlepages.com/repo.xml ).
We have iSolitare ( iphone.rustyredwagon.com/repo ).
We have scientific calc emulators from the resolved google code repo url.
We have cedsoft stuff from another source
I tried to add the chess one before, but it had malformed XML when I tested it >__<
Installer refresh stats won't make sense to be here (hehe)
We have Term VT from another source
and finally Weiphone one had a malformed XML when I tested it...


Other than that... I think I'm adding these in the next few days (to extend international support to areas where I can semi-comfortablely answer questions if they come in their native language, as well as tread into other sources to expand our package database):
Apogee LTD: apogeeltd.com
CedSoft: prog.cedsoft.free.fr (can't recall if this one had bad XML, too, will try again)
ChriB and Co: repo.itouchable.de
iUnlock: i.unlock.no (not sure if it'll be of much use since it's probably already unlocked?)
jComic repository: penjuinlabs.com/ipod
Limited Edition iPhone: limitededitioniphone.com/lei.xml
Ma3rpyr0's Source: mast3rpyr0.hopto.org/repo (Because it won't hurt to track it again and get the latest)
Macro's Repo: marcogiorgini.com/iPhone/plist.xml (Requested)
Taiwanese: iphone4.tw/unlock
HongKong: iphone.org.hk/repository.plist

I'll update this reply as I update the repos later

Great, thanks for the corrections/updates. I've updated my post to remove sources that are already tracked and tag those you will be tracking soon.

So, out with the old (safari plugin source) and in with the new (red = did not add, green = added):
Apogee LTD: apogeeltd.com - added
CedSoft: prog.cedsoft.free.fr - labeled "Beta"
ChriB and Co: repo.itouchable.de - added
iUnlock: i.unlock.no - malform XML
jComic repository: penjuinlabs.com/ipod - 404 Not found
Limited Edition iPhone: limitededitioniphone.com/lei.xml - added
Ma3rpyr0's Source: mast3rpyr0.hopto.org/repo - Empty source with proper descriptor but no packages
Macro's Repo: marcogiorgini.com/iPhone/plist.xml - added, Yeti3D? O.o
Taiwanese: iphone4.tw/unlock - Added, & bug fixed!
HongKong: iphone.org.hk/repository.plist - Added

Currently tracking:
33 Sources, 1057 Packages.

Thanks. I've edited the list and removed the ones that are now tracked, as well as JComic, as the URL is obviously bad. The rest I re-tagged appropriately.

It's getting there, slowly but surely.

Small bump -- any updates, Andy? I know you're busy with getting everything working well, just wanted to make sure I'm not missing anything yet. I've been busy with the blog switching over to a new host, new theme, editing that theme, etc. so I've kinda had my head in the sand when it comes to other things.

Also, if anyone has any repos not listed here that are not currently been tracked please let me know. It's hard keeping track of all the new repos popping up.

Nothing major on my end. I think the only thing that I added after this was the add entire category thing, and Chinese localization. I'm currently arranging Spanish and German localizations, and have most of the phrases for repo.sc translated by community contributors already. However, I might put those on hold until I get forum translations when they're available.

As far as the other development things goes, I'm refining a few things (right now, particularly the search feature) before moving on to the new features. But I'm also hindered by a project I need to do for my last class for university (keywords: bluetooth, cell phone, java, miltiplayer, rythm game)... I think by this time next week, when my first presentation is done, I'd have either more time to work on this, or a lot lesser time to work on this (as there is an open house presentation on 28th).

Edit:
Oh, btw, you don't need to bump, this is stickied hehe

iPod Touch Themes, Wallpaper, BatteryImages and more

http://www.ipod-touch-themes.de/installer/repo.xml

Being considered, thanks for sharing!


Note:
Added already (a while back actually)

Added already (a while back in previous reply denoted in green)

Added already (same with previous), but have been down for almost a week or more now. I might consider to remove it in case if they are having domain issues and someone pick it up to wreck havoc.

Cannot be removed from Installer unless you use third party tools or directly edit it out of the xml. Won't be tracked unless there is an obvious slow down resulting from fetching from their servers directly.

iPTF repo is back online, and there is a better one from Skylar on there as far as adding more preferences goes. We're already tracking iPTF, simply search for "Preference" and you'll get it as the only result (as of time of writing).

General note re: tracking of international sources...
I think I am only going to track the ones we have localizations for, for the time being. This is not because I'm racist or anything, but simply because I can't communicate with the original source owner if something were to happen, and also we can't communicate effectively with the users if the source were to go down or anything like that.

As of right now, we only have Chinese localization. I am working on getting German and Spanish localizations from the community (and most of the translations are ready for repo.sc; thank you!). However, German and Spanish won't be added until there is a translation for the forum UI, too. So that might need to wail until vBulletin 3.7 goes Gold, and people translate that. I am working on a Japanese localization, too, but my Japanese ability is limited, so that will take some time. I can understand basic French, too, so if someone wishes to help with a French localization, that'd be greatly appreciated.

... anything else... hm... I'll make a note of it later if I think of anything else

Thanks, I've removed those tracked sources from the list, as well as AppTapp because it can't be removed.

I'll keep the rest of the localization repos there just for those who might need them, even if they will never be tracked here.

Also, if anyone notices that any of the apps in the above repos are available on other repos that are tracked here, please let me know and I will tag that repo appropriately.