Easily boot into both WM or Android with Gen.Y DualBOOT.

20100129 gen.y dualboot v1.03 (ppc application) Gen.Y DualBOOT v1.03 (PPC Application)

This release is made for VGA devices, and supports booting Android both from Internal Storage (moviNAND, e.g. Touch Diamond) & Storage Card (SDMemory, e.g. Touch Pro). WVGA version and QVGA version is also ready. This app has been tested on WM6.1, but will work perfectly on WM6.5.x as well.

Keep in mind that your android setup must be installed already at the root of your storage card in order for this app to work correctly (e.g. Internal Storageharet.exe or Storage Cardharet.exe respectively).

http://forum.xda-developers.com/showthread.php?t=623792