Android SDK
http://developer.android.com/sdk
wiki
http://wiki.processing.org/w/Android
forum
http://forum.processing.org/android-processing
Good getting started tutorial:
http://blog.blprnt.com/blog/blprnt/processing-android-mobile-app-development-made-very-easy
another getting started tutorial (linux)
http://createdigitalmotion.com/2010/09/getting-started-with-processing-for-android/
tutorials + examples + multitouch I tried to demo
http://www.akeric.com/blog/?p=1411
Multi-touch library
http://lukehutch.wordpress.com/2010/01/06/my-multi-touch-code-ported-to-eclair/