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- WunderRadio (internet radio)
- InstaPaper Pro (saves webpages offline)
- Navigon (navigation)
- Newsstand (RSS reader)

- Pocket Informant *may* make my list if they ever update...
 
Out of what I own:

I Am T-Pain - autotune for the iPhone... Need I say more?
Convertbot - convert app that's very handy, very nice UI, and even has a calculator!
Luxor - very fun game
Spore Origins - also very fun game
ColorSplash - changes the background (or indeed the foreground) of photos to black and white!
 
ReelDirector - If you have a 3GS - this a must-have application which allows for video editing. Features include over 20 transitions, clip trimming, credits, and an overall great UI.
 
Productivity : LogMeInIgnition ( life saver )
QuickOffice
DocScanner
DropBox
Print n Share

Navigation : Navigon (anything but TomTom ...good grief )

Games : Soosiz (super Mario Galaxy in 2D )
Boost
NeuTron
TheDeep
Duke3D
VectorBall
Edge
wolf3d

Contacts : SyncInABlink

There are more , but these are my favorite
 
Best Web browser: [app]iCab Mobile (Web Browser)[/app]
Best IRC client: [app]FlowChat[/app]
Best Manga reader: [app]iManga Reader[/app]
 
GPSed GPS tracking service. Track your trips in real time, attach photos to tracks and share them in Facebook, Twitter, MySpace and Blogger.

GSPsed shouldn't make this list until it matures a bit. It has way too many bugs. Interesting idea but terrible and buggy implementation. Just read the reviews.
 
Byline is the superior RSS application with a simple, elegant UI and the ability to cache webpages (flawlessly formatted) for offline reading.
 
Games:

Peggle (puzzle)
Space Invaders Infinity Gene (arcade)
+1 Real Racing (Racing)
Tiger Woods PGA Tour (Sports)
Zen Bound (Puzzle)
Texas Hold'em (Cards)
Spider (Platformer)

Lifestyle:

iFitness (workout tracker)
Mixologist (drink guide)
Grocery IQ (grocery list)
Big Oven (Cook Book)
Weber's On the Grill (Cook Book)

Books:
Classics (e-reader)

Productivity:

AppSniper (apps on sale)
+1 1Password (password keeper)
Convertbot (conversions)
VideoSafe (encrypt video and pictures)
Postage (create cards from pictures)

Photo:

+1 Photogene (editor)
+1 Photoforge (editor)
Camera Bag (photo effects)
ColorSplash (selectively remove color from areas of photos)

Navigation:

Navigon (turn by turn gps)
GPS Sport by Motion X
 
I've only bought 3 paid apps and they all worth every penny:

Awesome Note (Productivity) - yes, it's awesome

AirTycoon (Strategy game) - so addictive I had to delete it after two weeks

Air Mouse (Utility) - best wireless trackpad you will have, truly amazing
 
Games

Doodle Jump
Pocket God
X-Plane games
I Am T-Pain :p
Flight Control
Harbor Master
Jelly Car

Others

ColorSplash (the one that colors/bw photos)
Classics (a well-done e-reader of sorts)
 
Hello Guys!
Here I would like to suggest you my favourite applications (only game & entertainment) for Iphone!!!

1. Harbor Master ($0.99 Updated Oct 21, 2009)
2. Crazy-Sounds ($0.99 Released Dec 16,2009)
3. Uno ($4.99 Update Sep 08, 2008)
4. Cartoon Defence ($0.99 Update Dec 23,2009)

Try it!!!!!!
 
Business:

- TouchToDo . . . An excellent and inexpensive To Do app. I keep all of my appointments on this app.

Reference:

- WordBook (English Dictionary) . . . A good dictionary, which is always available off-line. The original price has dropped quite a bit since I originally purchased it.

Productivity:

- mSecure: A wonderful password manager, which syncs and backs up to my desktop.

Music:

- WunderRadio: One of my favorite and oldest apps. This little app allows me to listen to my favorite local news and news talk stations where ever I am.
 
Business:

- TouchToDo . . . An excellent and inexpensive To Do app. I keep all of my appointments on this app.

Reference:

- WordBook (English Dictionary) . . . A good dictionary, which is always available off-line. The original price has dropped quite a bit since I originally purchased it.

Productivity:

- mSecure: A wonderful password manager, which syncs and backs up to my desktop.

Music:

- WunderRadio: One of my favorite and oldest apps. This little app allows me to listen to my favorite local news and news talk stations where ever I am.

KoGo 600 doesnt work anymore so I dropped this App
 
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