This is the update you've been waiting for...
1. Read Brandon Watson's blog post<http://windowsteamblog.com/windows_phone/b/wpdev/archive/2011/06/29/d...> - all of it
2. Download the Windows Phone Developer Tools Beta 2<http://bit.ly/wpsdk-b2>
You'll notice that with this update you now have the chance to update your retail phone to Mango. I'm in the process of doing this myself. Listed below are the high-level steps you'll need to follow (as suggested by Brandon Watson<http://windowsteamblog.com/windows_phone/b/wpdev/archive/2011/06/29/d...>).
* Read the instructions before updating, there are important steps you need to follow to the letter.
* Update your retail phone to Mango.
* Rub it in your friends' faces that you have Mango and they don't.
* Build Mango apps.
So go get the bits, get registered for AppHub<http://create.msdn.com/> if you haven't already, get Mango on your phone, and then have a blast building new and exciting apps for Mango.
Kelly White | Microsoft MVP - Windows Phone Development