Google's Android SDK- the user interface looks like a P.O.S! It's not touchscreen at all. When Steve said he would protect their touchscreen patents he meant it.
I hate the Windows-esque menus!
I suspect Android will be cleaned and dressed up by developers. But if the GUI remains like this Apple has nothing to worry about except for the $10 million. And oh yeah, the open source part may be worrisome also.