Bought an iPod Touch to finally replace my long-broken MP3 player. I've been using my PSP for months, which is a pain for many reasons as an MP3 player (most notably the size of it). So I'm willing to spend $10-$15 on games for the thing to give me some stuff to do on the way to San Fransisco this Sunday for GDC, and I'm looking for suggestions. Feel free to suggest free games/apps too. Almost any genre is fun to me, although I'm a little unsure about using the touch screen for dual analogs (feel free to prove me wrong with examples of it working great if you have any).
Update: I've got NOVA, Angry Birds, Doodle Jump, Pocket God, Uniwar, Jelly Car, Lux Touch, Real Racing, FAST, and Plants vs Zombies. I've spent my budget, but I'll take free game recommendations if you have any.