Check out
www.sinfuliphonerepo.com . It is a good repo for cracked apps.
I am running the following jailbroke apps.
1. QuickReplySMS (much better than BiteSMS and Tlert)
i disagree, biteSMS is better... i used quick reply on my 3g, didn't like it as much
2. MyWi 4.0
3. Infinite Board (vertically scrolls springboard)
too much scrolling!
plus it didn't scroll properly when i used it, it wanted to keep scrolling up and down, even when i was going left and right...
4. SBSettings
absolute must, and i recommend getting airplane mode sb setting toggle (name?)
5. WinterBoard

6. Installous 4

7. AppSync for iOS 4.x+
8. FaceBreak
what's this?
9. Live Clock
and this?
10. Pull to Refresh for Mail
11. Springtomize (allows for locking out default iOS features like Spot Search)
12. TetherMe
I love a jailbroke iPhone. I have been using a jailbroke iPhone since iOS 3.0 and a 3GS. I will never use an iPhone that isn't jailbroke. There are so many things that Apple leaves out of their iOS software that needs to be there.