This is the update you've been waiting for...
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).
- 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 if you haven't already, get Mango on your phone, and then have a blast building new and exciting apps for Mango.