Cool thread.
Only got 4 pages of apps at the minute, don't use many often to be honest either
I have on at the moment, in order of how they are:
Facebook
Cycorder - basic video recording tool using the iPhone's camera
Scribble - fun little free drawing tool
Shazam - Recognizes pretty much any tune you throw at it
Remote - Cool, but don't really use it
Lightsaber - kinda fun but don't use it
Locly - uses GPS to locate services/restaurants etc that are near to you
Cube runner - fun free game
Midomi - like shazam
Weatherbug - used to like how Swan and Dolphin was one of it's Orlando locations
Last.fm - kinda cool puts together playlists online of your favourite artists
UniCon - conversion tool
iFooty - news and results etc from my "soccer" team
Google Earth
Flixster - show times for local cinemas, includes trailers too
Air Sharing
Labyrinth LE - cool little maze game using the accelometer
IGN - video game reviews and videos
Wunder Radio - my favourite: live radio using the internet - can listen to stations from all over the world
Tetris
MXTube - lets you save YouTube videos
Bomberman
SimCity
Rolando
Air Mouse - cool little app letting you use your iphone as a mouse
ScummVm - Little emulator that lets me play games like Monkey Island on my iPhone; very cool
SwirlyMMS - MMS tool
Crash Kart
Disney All Star Cards
gpSPhone - Gameboy emulator - cool in theory, not great in practice
Monkey Ball
GroceryIQ - shopping list tool
Backgrounder - allows apps to "run in the background": good in conjunction with Wunder Radio meaning you can listen to the radio while using the rest of the phone's features
South Park Imaginationland - fun little game
Wedding Dash - another good game using the touch screen well
ClearCam - claims to improve the camera - seems to work too
Bounce On - fun platform game
Diner Dash - like Wedding Dash but set in a Diner - great game - very addictive
1112 Episode 1 - incredible graphical adventure - amazing how they managed to make such a game for the iPhone
Just downloaded Bejeweled 2 after seeing some on here had it