Did you or anyon try Pac-Man DX yet? I downloaded it this morning, but didn't give it a try. I LOVED the Pac-Man Championship games on 360. I'm curious how the game plays with the phone controls. I don't think I'll be buying it at $7.
The controls are surprisingly good. It's sooo much easier than the original game. You swipe anywhere on the screen to turn, and an outward pinching motion launches bombs. If the ghosts even get near Pac-Man, the game goes into slow motion, giving you an increased opportunity to escape.
The only bad thing about the game is it's only got 3 mazes instead of the XBLA version's 9, and a few less visual styles (3 instead of whatever the original # was) to choose from. But it's super fun and easy to play, at any rate.
As for hitting the capacitive buttons, try putting a rubber band between the screen and the buttons to create a barrier for your fingers.