One of the major advantages of jailbreaking your iPhone is to get free and premium Cydia apps & tweaks on your iPhone but before to do so you need to add some Cydia Resources or Repositories.
There are a lot of Cydia resourecs available but we will give you a list of top 10 reliable Cydia Resources of 2012.
Insanelyi http://repo.insanelyi.com
BiteYourApple http://repo.biteyourapple.net
P0dulo http://p0dulo.com
iHacks http://ihacksrepo.com
xSellize http://cydia.xsellize.com
Sinful iPhone http://sinfuliphonerepo.com
iCauseFX http://repo.icausefx.com/.
Hackulous http://cydia.hackulo.us/
HackYouriPhone http://repo.hackyouriphone.org
Pwn Centre http://apt.pwncentre.com