What Are The Best Apps for an iPhone 3G?

Thing is I just bought an iPhone 3G and im new to this... Im a fan of technology and everything that has to do with it. Until now the apps i got are: Caller id Faker, My Tones,Twittum, iMsn,MiM, Text Pics,Tiger Text and Hide n See, now that you know my taste please help me get some apps