With Froyo now able to be run on the Milestone, the chances of custom flashing the X are looking good. I know that the official Froyo release is just around the corner for us, but soon after that... Gingerbread ROMs?
FRF91 Froyo Running on Motorola Milestone - Droid Life: A Droid Community Blog
FRF91 Froyo Running on Motorola Milestone - Droid Life: A Droid Community Blog