Processing for Android is now out. Peter Kirn has posted an interesting article at Create Digital Motion about it:
http://createdigitalmotion.com/2010/09/getting-started-with-processing-for-android/
Processing now runs just as easily on a mobile platform with Android. You can try it with the free SDK and emulator, but it’s most fun with a device. Using all free software, you can sketch easily on mobile and desktop from one environment, and with only minor modifications, run the same code on a desktop, a browser, and a mobile device.
Check out also the related Wiki:
http://wiki.processing.org/w/Android