Video introducing it:

http://youtube.com/watch?v=1FJHYqE0RDg

SDK is available, and all free software (or will be shortly, at least):

http://code.google.com/android/

The GUI API is not like MIDP2.0, so it’s not compatible with existing J2ME apps, like Hecl. Hrmph. Seems like Java 5 constructs are supported (I also wonder what those hex addresses are doing in there):

http://code.google.com/android/intro/hello-android.html

In any case, very interesting, and very cool. It certainly changes things a lot, though – until this becomes commonplace, it will just add to the number of platforms that need to be supported, which might actually make life tougher for a while. All things considered, though, you can’t complain about getting something that cool under an open source license!