LightHeaven
Regular
Here's their signup link:
http://www.xbox.com/en-us/Developers/id
Of note:
As to what that means I'm not totally sure, but it seems to imply that they want more than just "created by one developer" type indie games. Seems like they want more elaborate content this time around. I'll find out I guess, I'll register in a few days and see what happens. Worse case they say no.
That's only for devkits loans. Some time next year they will allow using retail console as a debug unit, and then one man Indies will be able to submit their games (They'd still have to be certified, though)