Windows Mobile: If youre interested in trying out Android but youre locked into your current contract with a Windows Mobile phone dont despair. Quite a few Windows Mobile phones have the right hardware to support Android booting—without erasing Windows Mobile.Most of the time when you want to do something wild and new with your phone it involved flashing the on-board ROM. This clever hack doesnt require you to nuke your phone and start from scratch, however, you just need a compatible phone, a non-SDHC microSD card, and the patience to tinker a little.

via Run Android on Your Windows Mobile Phone.