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.

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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.