Camera+ - Hands down the best camera app on the whole AppStore.
AppStore
Finger Piano Share - Learn how to play all your favorite songs from the Twilight saga, Beethoven, Harry Gregson Williams, Derp on the 'Piano'.
AppStore (Minor bugs exist, such as that some notes cannot be played, yet it isn't really problematic...)
Soundhound - 'I soooo want to know what's that song on the radio called, so I can download it over torrents when I come home. And now I can, because this App tells me which Music I'm listening to!!1oneone' Yeah, uh, mostly that.
AppStore
Touchgrind - Fingerboard. Period.
AppStore
Pinball Dreams HD - A 'good old' pinball game, just like on the Commodore Amiga. Well, except the fact that you don't have to chang- PLEASE INSERT DISK B TO CONTINUE
AppStore
Draw Pad Pro - Ever wanted to draw/note something, yet you hadn't had a pencil and paper? Problem solved. (Use with Dagi Stylus for extra accuracy)
AppStore
Scan - Used to scan QR- or barcodes.
AppStore
Ocarina -
:3
AppStore
Speedtest - So your Internet feels somehow slow as crap today? And you're sure it isn't your computer? Now you can be sure it's !
AppStore
Pulse News - All your news pages at your finger tips. Read as: Bloated RSS reader for Apple hardware
AppStore iPhone/iPod /
AppStore iPad
Delivery Status Touch - Ordering way too much crap online? Lost the overview over the orders? Want to know when you'll be getting crap from Amazon you've pre-ordered like in the 1990's (felt)? Use this.
AppStore
eBay - Are you tired of searching eBay all day long for that $10 iPad 2 some Idiot is selling? With eBay Mobile you can be notified via push when people sell their stuff. -
AppStore
eBay Classifieds - Don't know how to describe it. I would say a "mobile Reviermarkt", but then again, anyone other than people from the Ruhrpott in Germany would most likely not get it. :/ -
AppStore /
AppStore GER /
AppStore NL (Dunno if these exist in other countries. Feel free to contribute, if I missed 'em...?)
- I seriously don't know if Apple enabled these with iOS5, but if they haven't, you can download it for emoticon fun in your messages.
Facebook /
Facebook-Messenger - Self-Explanatory, eh?
AppStore Facebook /
AppStore Messenger
Find my iPhone - So you're that klutz who always loses his valuable and loved iPhone? Use this to track your Phone if you lose it again or if it gets stolen.
AppStore
I love Katamari - Naaah Na-na-na-na-na-naaaa na na katamari damashi. Naaaah na-na-na-na-na-naaaa na na katamari damashi!!
AppStore
PhotoSynth - Wave your iPhone around to create viewtiful panorama-shots.
Appstore
I think thats it for now. I'd have listed so much more, but most of my apps are only useful if you are a german citizen (like managing your bank-account, looking up the schedule for the tram, blablah...). :/
Plus I'm sorry if any of the links redirect you to the german AppStore. I'm sure that I checked and edited all of them to show an english page, but yeah, making errors makes us human, right?