Alright, I just got another iPhone (my previous was stolen over a year ago, damn ghetto)
This thread is just to showcase apps you found that you think are cool.
Facebook - free - wow, I had the original and man they improved it, it has almost all regular facebook features.
360 - $.99 (iTunes) Basically it creates a 360 panorama extremely easily.
Human Japanese Lite - free (iTunes) It teaches you how to speak Japanese, pretty cool IMO.
Infiniti Blade - $5.99 (iTunes) Its a middle age style game where you battle your way through a castle to fight some evil ruler. Its not free roam but the fighting is turn style. Great game and amazing graphics
Ringtone Designer - $.99 (iTunes) A MUST HAVE for all iPhone users, you use songs on your iPhone to create you own ringtones, you can also record your own voice or sound