Yup, that's what I do. I have an HTC HD2 that shipped with WM6.5 and am running Android 2.2 on it now. Just a few days ago some hackers figured out how to run

Yup, that's what I do. I have an HTC HD2 that shipped with WM6.5 and am running Android 2.2 on it now. Just a few days ago some hackers figured out how to run WP7 on it too.