Very interesting post over at Windows Phone Hacker. Essentially, if you backup your Windows Phone using this Zune backup tool and then run the tool offer at WPH, it will prompt you to install Mango beta the next time you open Zune. I've gone through the first two steps. Downloading and installing Windows Phone Developer tools downloading the Zune backup tool over at XDA (which requires this file). I've successfully made the backup. Now I'm considering the big jump to try the tool the allows you to download the beta of Mango. Please note that I'm not recommending or endorsing you do this to your phone. If you phone bursts into flames, becomes a brick or is nothing more than a plastic slice of toast, I'm not responsible.