"I spend a lot of time in front of my iPhone. It is the primary way I access my personal email, use Twitter, and read RSS news feeds, and I use Safari quite a lot."

I've had my iPhone 3Gs for 10 months now and I totally agree with what you say. I have a full 11 pages of apps (Roll on Folders feature in OS4) and am constantly using many of them. The only ones I have in common with you are Livejornal, Spotify & Skype and I agree that the multitasking feature will be very usefull. Oh also just spotted I have Mini Piano aswell.

Apps I could recommend and were free when I downloaded them are:

Augmented Reality App, Acrossair

Text-to-Voice App, NeoPaul/NeoJulie

Text Language Translator App, iTranslate

Mini Seismograph App, iSeismo

Backgammon App, iGammon

Create Music App, TonePad

Tetris Like Game, LineUp

Puzzle Game, Spikey

Photoshop App, PS Mobile

and last but by no means least, Mini Video Client for Twitter, 12UP

It makes the iPhone experience an ever changing one.