Desire HD owners have had their hands on some previously leaked versions of Gingerbread, and the final shipping version of Gingerbread for the device has now appeared. It's unbranded so you need not worry about any carrier bloat added and all apps thus far are up and running perfectly fine for me.
If you're a Desire HD owner and looking to get in on Gingerbread, this is a pretty good build to start off with. A few caveats to remember, if you're rooted, you will lose it but it is easily regained by installing Gingerbreak. You will of course also want to back up your data depending on how you decide to flash the ROM but realistically, you should be back up your data anyway.
The download is available in RUU form or if you prefer, just grab the PD98IMG.zip file and load it through the boot loader method. This will work for all Desire HD devices as you do not need to be rooted in order to load it up, nor do you need S-OFF. If you're not down with doing all of that, sit tight -- I'm sure a lot of custom ROMS for this will be along soon in addition to an official release.