I don't think Apple has a patent on multi-touch specifically. If so the USPTO REALLY REALLY screwed up. But rather they obtained a patent based on certain gestures (e.g. pinching). Which is still a screw-up. So even if Google had multi-touch support built in, Apple couldn't do anything as long as Google doesn't do pinch zooming. But it's more likely that Apple realizes their patent is worthless if any court case were to look into it so they're hoping nobody else realizes that. :P I really do wonder what's going on.