Oh cool! I got all the way to the registration page! At some point they even sent me a "confirm this is your address" e-mail.
What I did was logged in over at live.com, because the first time it looked like it was going to hang there.
I actually got a different error the second time I tried, and it actually had the words "productkeys" in it... exciting!
After hitting continue I either get the screenshot I posted above, or this...windows 7 beta available for free Jan 9 (!)
Which apparently has some secure and some nonsecure items, it only stays up for a second, at which point it changes to this...