Code
android-touchexample
This is the example project to match a post on the android-developers blog detailing how to work with touch events, multiple pointers and gesture detectors.
The related blog post and tutorial is here: http://android-developers.blogspot.com/2010/06/making-sense-of-multitouch.html
The cupcake branch accompanies another android-developers post, which ports the original code example to be compatible from API 3 (Cupcake) through API 8 (Froyo). http://android-developers.blogspot.com/2010/07/how-to-have-your-cupcake-and-eat-it-too.html