Dual-Boot Windows Phone 7 and Android on the HTC HD2
You may have heard that the HTC HD2 can be hacked to run both the Windows Phone 7 OS and the Android OS. But now it can run both...at the same time!
Ok, not really at the same time (I'm sure you're imagining some sort of crazy WinPho7-Android mash-up), but from the same partitioned SD card.
The cool kids over at xda-developers have put up a tutorial on how to partition an SD card to run both Windows Phone 7 and Android. It's not exactly a one-step process, so they also went ahead and made a video.