Just a small update. My app Under Bridge graffiti was just published in the marketplace. You can check out the page I made for it here http://underbridgecity.net/underbridgegraffiti/
I will soon blog about how I was able to get multi touch set up in the app. Also I am going to test out how I set up trial mode to make sure that if a user hits the back button after buying the app, it checks on activate so you don’t have to restart the app.