Windows Phone 7 'NoDo' update for HTC HD7 makes unofficial debut
The ROM has been shared at XDA, and is intended for the European HTC HD7. Users in other regions aren't totally out of luck, but a bit of additional tinkering is required. We'd recommend waiting it out at this point, since the NoDo update is due in the very near future anyway.
If you're wondering, the name 'NoDo' comes from the fact that someone failed to bring donuts to a (seemingly important) Windows Phone 7 meeting.