Cydia is an awesome place.  But to get the most out of the jailbreak experience you must have the best sources available.  I have included the best Repo/sources available in Cydia at this time.  Some take a few minutes to load.  Others, may say they are unavailable.  You could get an error or unavailable due to the large number of people adding these sources.  If this occurs simply just keep trying.

Top Ten Sources For Jailbreak 2012 iPhone 4S and iPad 2

Banned iPhone http://h7v.org

Hackulo.Us  http://cydia.hackulo.us

HackYouriPhone  http://repo.hackyouriphone.org

iHackStore  http://ihackstore.com/repo/

iNsanelyi Repository  http://repo.insanelyi.com

iOS5Beta –MyRepoSpace  http://cydia.myrepospace.com/ios5beta

ModMyi  http://apt.modmyi.com

ModYouri 

Nadis Lai’s Game Mods  http://imodgame.appspot.com/

Xsellize  http://cydia.xsellize.com

Hope You Enjoy!!!!!!