Even though it is Honeycomb that was obtained from the SDK, (Google has yet to publicly release the source code for Honeycomb), they managed to get it up and running on the X10. As usual with all first builds, the phone is barely functional with the ROM but give those developers a few weeks and some magic is bound to happen.
What works:
No download is available for you guys to test it at the moment but you can expect it to arrive soon. Folks with itchy hands are no doubt going to have a ball of a time playing around with Android 3.0 on their phones. Head over to the official thread on XDA-developers for more details.