Talk about confusing origins, but the Nokia N80 tablet, which typically runs the S60 Symbian platform, is now dual-booting Windows CE and Android courtesy of VMware technology. Windows CE is the base behind Windows Mobile. The VMware solution allows for virtualization, meaning you can have both operating systems running at the same time.
Unfortunately, the YouTube video posted over at Engadget Mobile is no longer available, but the possibilities for this is exciting if you prefer one operating system for your personal life, but are strapped to another one for work. The software, called VMware MVP, is due sometime this year.