Here's a list of the apps on my iPhone:
Facebook - nice interface for simplified facebook access
tweetie - fot twitter - good for managing your account, adding follows
TweetDeck - better for reading tweets than tweetie, but not as good for managing the account
Google reader - newsreader, easy to use
To Do's - very simple to do lists - should come with the iPhone
google app - voice activated search is awesome
Google earth - just like the PC version, but multi-touch control is better
Tunein – iCarRadio - hundreds of radio stations streamed across a GSM signal
TVGuide - now & next tv guide
Evernote - online storage of lists, links &photos
Jotnot - document scanner using the built in camera, squares up a document and ads contrast
Flixter - search for movies showing at local cinemas
Taptu - directory of iPhone optimised websites
iMathematics - maths handbook of formulae with scientific calculator and wolfram alpha access
Sky News - top news stories
Telegraph - simplified news interface
Wikipedia - optimised wikipedia interface
AccuWeather - location aware weather forecasts withhourly and 15-day forecasts
rightmove - how much is the house for sale in your street?
Ocado - online grocery shopping, very nice & simple
Amazon UK - iPhone optimised interface
eBay - iPhone optimised interface
BlogPress - post to your blogspot blog
AroundMe - find shops and sevices based on current location
Yell.com - yellow pages search tool
Yelp - similar to around me , slightly different database
Rise&Shine - bed side alarm clock
WiiTrack - find WiFi hotspots
Bell&Ross - clock based on the famous watches
FREE Wi-Fi - durectory of public wifi access points
RulerPhone - measure the world around you using the iPhone camera
iHandy level - electroic spirit level and angle finder
StepTrakLite - pedometer
Zipix Lite - fixes exposure and contrast in photos with one click
Shopping List Lite - make a shopping list and check off as you go
Flickr - search and upload to flickr
ITN News - similar to sky news app
NetNewsWire - newsreader - I prefer Google Reader, but this is a usable RSS reader
Microsurface - play with the touch controls using your photographs
Jaeger-LC - catalogue of beautiful watches
IcanHasCheezBurger - lolcats
XKCD - web comic
fix my street - complain to your council, it works!
urban spoon - restaurant finder
Tioti TV - tv guide, better than TVguide with more functions
Pirates lite - dualling pirate ships ahoy! Arrr
FreeCell - card game, free because you have to se an advert before each game
ParaPanic - save the cartoon parachutists
Sol Free - selection of patience card games
StoneLoops - match the coloured stones
GumDrops - match the coloured drops
Minesweeper - straight from windows
Centipede - by Atari - faithful recreation of the arcade game
Bejeweled - match the coloured jewels, by Popcap
Paper toss - throw balls of paper in a wastevasket (better than it sounds)
Pac-Man - faithful recreation of the arcade game
DietWordPop - word building game
Distant Assassin - shoot the cartoons
Solitaire city - another patience card game
UNO free - SNAP with a twist
Maze finger - drag your finger around the maze - harder than it sounds
iDaft - play your own mix of Daft Punk
TonePad - your own little Tenori-On
Tap Tap revenge - guitr hero type game
touch chords - learn guitar chords
iShred - guitar simulator
fluid - touch control demo, realistic liquids
Shazam - identified music tracks being played
Guitar rock another guitar hereo type game
Nubi D0 - to do list - more comprehensive than To-Do
Yahoo - search, directory and utilities
Autodesk fluid - another touch demo
Ruler - measure small things with an on-screen ruler
Chain Rxn - addictive bouncing ball game
SketchBookX - draw with your finger
Sky Sports Football Score Centre - real time football results and game information
ECB Cricket - excellent live cricket scoreboards
Yetisport - throw the penguin
RedLaser - fantastic bar code scanner and price comparator