Favorite Free and Pay iPod Touch/iPhone apps

I'm trying to get a few more apps as my screen is kind of bare. Which would you recommend and why?

I have Kotoba! on mine right now and it is by far my favorite free app. It's a Japanese/Kanji dictionary that gives a breakdown of the words you look up as well as how to write the kanji for it properly.

My favorite pay one is the USA Today crossword app. Great time killer that keeps your brain working.

Some good games i like are tapdefense, iBowl, labyrinth le, and tap tap.

Some other good ones i liked are night stand, backgrounds and wifinder. Backgrounds needs a wifi connection but they have some kool wallpapers. WiFinder really does just that. It scans the area and finds wifi hotspots.

And all those are free. :)

Free: Tap Tap Revenge, Cube Runner, Jelly Car, Cradle, WiFinder, Zippo Lighter

Paid: Spore, Pianist, AirSharing, Reign of Swords, Air Mouse, Laybrinth, Kitten Jump