Some enterprising soul over at XDA developers forum has gotten hold of the Treo 750 Windows Mobile 6 ROM, apparently the same one AT&T is planning to release as an update soon.

The directions are surprisingly simple, needing only a miniSD and a few minutes of waiting. Check out the forum for the complete instructions, and links to the ROM as well. Just remember that this update isn't so official, so it's a great way to void the warranty. Meaning you'd better know what you're doing.

Thanks to gadgetsonthego.net for the heads-up.