Sleepers.net just posted a list of most Cydia and Installer repos. I think that is great information for users that have jailbroken iPhones. I copy/pasted the list here but I invite you to visit Sleepers and Digg their post.
New Cydia Sources
app.ifonetec.com: http://app.ifonetec.com/cydia/
cake.mapleidea.com: http://cake.mapleidea.com/cydia/
BigBoss & Planet-iPhones: http://apt.bigboss.us.com/repofiles/cydia/
Hack&Dev.org: http://iphone.hackndev.org/apt/
Hackers.nl: http://apt.hackers.nl/
iClarified: http://cydia.iclarified.com/
iPhone-notes.de Repo: http://apt.iphone-storage.de/
ispaziorepo.com: http://ispaziorepo.com/cydia/apt/
MacCiti – http://macciti.com/cydia
ModMyiFone.com: http://apt.modmyifone.com/
Niklas Schroder: http://apt.paperclipsandscrambledeggs.com/
RichCreations: http://www.richcreations.com/iphone/apt/
SaladSoft: http://nickplee.com/cydiasource/
Ste Packaging: http://repo.smxy.org/cydia/apt/
Steffwiz: http://steffwiz.webs.com/iphone/repo
Telesphoreo Tangelo: http://apt.saurik.com/
urbanfanatics.com: http://urbanfanatics.com/cydia/
WeHo.ru: http://weho.ru/iphone/
www.iacces.com: http://www.iacces.com/apt/
ZodTTD: http://www.zodttd.com/repo/cydia/
NEW Cydia Language Sources
comcute&gecko (Estonian): http://gecko.pri.ee/cydia/
CZ&SK: http://csid. tym.cs/repo/
iPhone-patch (Bulgarian): http://mspasov.com/
iphone.freecoder.org (Chinese): iphone.freecoder.org/apt/
iphonehe.com (Hebrew): http://iphonehe.com/iphone
Marcin Laber (Polish?): http://cydia.i-apps.pl/
Sources for Installer 4.0
Big Boss: http://apptapp.thebigboss.org/repofiles/installer4/
iPhone-notes.de: http://i.phone-storage.de/
iSpazio: http://repo.neolinus.org/ispazio/
ModMyiFone.com: http://i.modmyifone.com/
Rip Dev: http://i.ripdev.com
Ste Packaging: http://repo.smxy.org/installer4/
German: http://sendowski.de/iphone
Sources for Installer 3.1
Community Sources for Installer 3.11
iSpazio Official: http://repo.ispazio.net
ModMyiFone.com: modmyifone.com/installer.xml
RiP Dev (Kate, formerly Caterpillar): http://repository.ripdev.com/
Ste Packaging:http://repo.smxy.org/iphone-apps/ (make sure you include the last /)
Other Sources for Installer 3.11
aka.Repository: akamatsu.org/repo.xml
AlliPodHax Source: ihacks.us/index.xml or allipodhax.3host.biz/index.xml
AlohaSoft 1.0.2 – homepage.mac.com/reinholdpenner/102.xml
AlohaSoft 1.1.1: homepage.mac.com/reinholdpenner/111.xml
AlohaSoft 1.1.2: homepage.mac.com/reinholdpenner/112.xml
Apple (not really Apple): applerepo.com
Apple Daily Times: www.appledailytimes.com/installer
AppTapp Official: repository.apptapp.com
Apogee LTD: apogeeltd.com
Blaze Official: blazecompany.googlepages.com/
BigBoss Beta: sleepers.net/iphonerepobeta
BlackWolf: m8an.de/ownrisk.xml (Extended Preferences)
Byooi Digicide: byooi.com/iphone/digicide.plist (Jiggy Apps)
CedSoft (iSnake/Bounce): prog.cedsoft.free.fr
Chris Miles Repository (iSolitare): iphone.rustyredwagon.com/repo
Conceited Software Beta: http://conceitedsoftware.com/iphone/beta/
Conceited Software: http://www.macminicolo.net/conceited/iphone/cache.plist
CopyCoders: homepage.mac.com/hartsteins/copycoders/copycoders.xml (Network Apps)
window.google_render_ad();
dajavax: dajavax.googlepages.com/repo.xml
databinge: repo.databinge.com
DavTeam: davteam.com/repo.xml
Death to Design: iphone.deathtodesign.com
Digital Agua: repo.digitalagua.com
Dlubbat’s Apps: www.dlubbat.com/iphone.xml
Ettore Software Ltd: ettoresoftware.com/iphone/beta/ty.iphone
Fight Club: dezign999.com/repo
FreeMyiPhone: pxl.freemyiphone.com/
Fring: fring.com/iphone.xml
Gogosoft Source: www.blackblack.org/gogobeta.plist
GravyTrain ’s Vault: iiispace.com/installer2.xml (Includes user submitted themes)
Hijinks Inc.: hijinksinc.com/i/installer.xml
hitoriblog Experimental Pack: hpcgi3.nifty.com/moyashi/ipodtouch/repository.cgi
HighTymes: hightymes.org/iphone/plist/index.xml
iApp-a-Day: iappaday.com/install
Imagine09: home.twcny.rr.com/imagine09/Imagine09.xml
iBlackjack: iphonefanclub.com/native
iClarified: installer.iclarified.com
iFoneTech: app.ifonetec.com
Intelliborn: intelliborn.com/repo
Intelliborn (Cydia Source): intelliborn.com/cydia
iPhone Cake: iphonecake.com/src/all
iPhoneDevDocs: idevdocs.com/install
iPhone For Taiwan (SummberBoard Themes): iphone4.tw/showme
iPhoneFreakz: iphonefreakz.com/repo.xml
iPhoneIslam: apps.iphoneislam.com
iPlayful: iplayful.com/r
i.Marine Software (Caissa): caissa.us
imimux Repository (Real Artist): imimux.com
iPod Touch Fans: www.touchrepo.com/repo.xml
iPod Touched: ipodtouched.net/repo.xml
iPod-Touch-Themes.de: www.ipod-touch-themes.de/installer/repo.xml
iSwitcher (old): web.mac.com/iswitcher2/list.xml
iSwitcher (new) = MeachWare: meachware.com/list.xml
Jeremie Engel: rep.visuaweb.com
Jiggy Main Repository (Jiggy): jiggyapp.com/i
lazyasada: lazyasada.xeterdesign.com/repo.xml
Limited Edition iPhone: limitededitioniphone.com/lei.xml
Loring Studios: loringstudios.com/iPhone-schnapps/index.xml
McAfeeMobile Dev Repository: ipkg.mcafeemobile.com
MarcoGiorgini.com: marcogiorgini.com/iPhone/plist.xml
Makayama Software (CameraPro): tinyurl.com/2t8cax
MaomaLand: maomaland.com/iphone/repo.xml
Mateo (BeatPhone): bblk.net/iphone
McCarron’s Repo: patrickmccarron.com/irepo
MeachWare (new iSwitcher): www.meachware.com/list.xml
Mkv iPhone Repository: repo.mkv.mobi
Mobile Stacks: mobilestack.googlecode.com/svn/repository/internal.plist
ModMyApple.it (iBirthday): www.serverasp.net/chiafa/MMA/repo.xml
Moyashi: hpcgi3.nifty.com/moyashi/ipodtouch/repository.cgi
MTL Repository: home.mike.tl/iphone
MyApple.pl: i.myapple.pl
newATTiPhone.com: newattiphone.com/repo.xml
NPike.net: http://apps.npike.net/repo.xml
Nuclear Design: nucleardesign.net/repository
Planet-iPhones: planet-iphones.com/repository
Polar Bear Farm: www.polarbearfarm.com/repo/
Polleo Limited: source.polleo.no
Private Indistury: brandonsgames.com/chriss/index.xml
Pyrofer’s Projects: pyrofersprojects.com/repos/repos.xml
R4m0n (iPhysics): iphone.r4m0n.net/repos
Robota Softwarehouse: iphone.robota.nl
Sanoodi Repository: sanoodi.com/iphone
Saurik’s Coding Toolbox (Cydia): apptapp.saurik.com
ScoresPro: www.scorespro.com/iphone/repo.xml
scummVM: urbanfanatics.com/scummvm.xml
sendowski.de (MobileChat)sendowski.de/iphone
Shai’s Apps: ride4.org/shai.xml
Simek’s Graphic: simek.ddl2.pl
sipgate repository: iphone.sipgate.com
Skrew: i.danstaface.net
Slezak’s Stuff: www.spencerslezak.com
Smart-Mobil: www.smart-mobile.com/beta
Soneso Repository: soneso.com/iphone
SOS iPhone (ContactFlow): rep.sosiphone.com
Spiffyware: spiffyware.net/iphone
Studded: studded.net/installer/index.xml
Surge: iphonesurge.com/iphonesurge.xml
Swell: lyndellwiggins.com/installer/Swell
Swirlyspace: swirlyspace.com/SwirlySpace.xml
Touchmod Team: touchmods.net/rep.xml
Trejan: trejan.com/irepo
Trivialware: mazinger.cs.yale.edu/iphone-apps/index.xml
Unlock.no: i.unlock.no
weiPhone (weTools/weDict): app.weiphone.com/installer
Wiki2Touch: 168weedon.com/i/
Wizdom on Wheels (Common Website Links): iphoneapps.wizdomonwheels.com
XK72 Repository: http://xk72.com/iphone/repos/
ZodTTD.com Releases: zodttd.com/repo
Language Sources for Installer 3.11
Arabic: apps.iphoneislam.com
Czech: repo.iphone.cz
Chinese: iphone.org.hk/repository.plist
Danish: iphone.vildmedmac.dk/install
French: rep.sosiphone.com
FrenchIphone: rep.frenchiphone.com
German: sendowski.de/iphone
German aXP: lostsoul.aeroxp.org/iphone/index.xml
Greek: greekrepo.com
Hebrew ?????: ihebrew.net
Hungarian: ifhone.hu/install.xml
Norwegian – iFon: install.ifon.no
Polish – iPolish: krzak.net/iphone
Polish – iPolish(1.1.2): wakoman.ovh.org/iphone
Português-Brasil(1.1.2): iphonemod.com.br/forum/repo/installer.xml
Russian iPhone.RU: iphones.ru/r
Russian iPhone ??-??????: russianiphone.ru/beta
Russian Tools (in English): russianiphone.ru/beta/en
Spanish Phyros iPhone-ES: iphone.frickr.es/index.xml
Swedish iFun.se: ifun.se/swe
Taiwanese: iphone4.tw/unlock
Thai: pradt.net/iphone
Turkish: niffob.com/triphone.xml
Vietnamese: iphone.billydragon.net