Storm. There's stuff in here for regular folk without a single programming bone in their bodies, too -- namely, a full-fledged emulator that appears to have all the features and functionality you'd expect the real thing to have. It's a gas to play with -- even more fun than that semi-functional G1 demo T-Mobile has up and running -- and it's a good way to test-drive the goods without laying out the cash first. Not to say you could even if you wanted to, since the phone's not dropping for another month at a yet-to-be-determined sticker price.
[Via Phone Scoop]
Update: Be sure to select Simulators v4.7.0 to get the goods -- otherwise you're going to go through some ridiculously long download, only to discover that there's no Storm to be found. Wouldn't that just suck?