Now that Windows Phone 7 (WP7) has been entering the market, it it getting some interest. But, not everyone is willing to completely commit to it yet. So, darrengladlysz, from XDA-Developers, created a tutorial on how to Dual Boot your SD card in order to give Windows Phone 7 a try, but while keeping Android around just in case. darrengladlysz got this to work on his HD2, but I’m willing to bet that if there is a Windows Phone 7 port for your Android phone, that works off SD, that you can use his tutorial to get Windows Phone 7 on your device.
You can check it out here at XDA-Developers.com
Take a look at a video, WP7 looks exactly like Zune: