A member of the XDA-Dev community has managed to run Google's Android OS on the HTC TyTN II smartphone.
The proof of that you will find below. Anyway, it looks like this is not a fully functional operating system; rather it is an executable for Windows Mobile. However, if that's true, there's a possibility that Android will be compatible with other WM-based devices.
Well, that's all we had to tell you, but stay tuned for more details. Meanwhile, here's the video from xda-developers.com: