apps

ok heres my list of must have apps...

System affect apps

Installous (of course)

Backgrounder

Categories (allows u to put apps in folders)

BossPrefs

Status Notifier

Winterboard (changes the look of ur iphone very customizable bit dificult sometimes though)

Utlities

Units (just what it sounds converts things for u)

GroceryIq (makes grocery list of stuff.. sounds wierd.. but i use it a lot)

Tweetie (twitter client)

Apps

Bookshelf (ebook reader)

MewSeek (think limewire for ur iphone)

Craigslist Mobile

Games

Guitar Rock

Warfare

Arvale

Puzzlequest 

Topple (tetris like game)

LuxDLX (risk like game)

Simcity

iShoot

Solar quest

Dactyl