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