You can now dual boot Windows Phone 7 and Android on your HTC HD2. We already shared a guide for this [Written Guide]. But video is always better than any written information. 96edwy, a senior member of XDA Developers forum has created 2 videos showing dual booting HTC HD2 of Android and Windows Phone 7. 96edwy’s Video Program kept crashing when he was saving the video in whole 1 part. So, he divided the video into 2 parts.
We recommend you to backup all your settings and apps on android just incase you want to go back [Video].
Prerequisites that you need for dual-booting Windows Phone 7 and Android on HTC
HTC HD2: How To Dual Boot Windows Phone 7 & Android (Part-1)
HTC HD2: How To Dual Boot Windows Phone 7 & Android (Part-2)