Yes, I have an iPhone - as if you didn't already know if you're following me on Facebook or Twitter. My app selections usually fall into a few categories:
Social Apps (FB, Twitter, HootSuite, Four Square, etc.)
Korean Learning Apps (WordPower, KC101, LingoPal, etc.)
Games (DoodleJump, Sheep Launcher, Flags Fun, Unblock Me, etc.)
Travel: (Zipcar, Expedia)
Randoms: (Currency Converter, All Recipes, Shazam, eBay)
And now I have a new "must have" to write about for the Games category. Last week I bought "Impossible Test" which is a free* app made by Pixel Cube. This game is addictive, short and definitely a brain teaser. There are about 40 - 50 (you lose count after a while) quiz screens. Nothing is inherently hard, but it makes you think through and actually read and digest every little thing that you see. The goal, once you finally make it through all the quizzes, is to try to get the fastest time. My fastest time so far has been 235 seconds. ^_^
*incidentally it looks like there's a charge for the game on the actual website - so non Apple product holders may have to pay to check out this game...
If you have an iPhone, iTouch or iPad (although I don't know if it's free on the iPad), I highly recommend you get it! Especially since it's free, you have nothing to lose by downloading it!