If you missed it a few days ago, before HTC pulled it, you can once again grab youself the official HD2 ROM upgrade.
Simply hop here http://www.t-mobile.com/wmupgrade/ and type in your IMEI to download the latest ROM.
Couple of things, for the 15 digit IMEI: if you have 17 digits, just leave the last 2 off. Second, yes, this is the exact same ROM as the "unofficial" one from a few days ago: same size, same numbering, no reported differences in performance. So if you're already flashed, no need to do it again.
Read all the details in the press release right here.