He created a pinch zoom hack for the G1. He said because multitouch was included in 2.0 he could do it without the Droid being rooted. He said he would need the 2.0 source code to be available before he could start.
Here is his G1 hack. Not perfect, but the G1 doesn't even have multi touch
Here is his G1 hack. Not perfect, but the G1 doesn't even have multi touch