October 12th is the big day. That’s the date for the Windows Phone 7 Developer Launch events and the MSDN Simulcast event you can sign up for, that'll be a full day of training on writing Windows Phone apps.
In the US, there are also a lot of live in-person Free Events to learn Windows Phone 7 Development listed at http://www.msdnevents.com/wp7devlaunch. I encourage you to register now as they are filling up fast.
Not excited enough? Well, Scott Hanselman has worked some magic so 2 of you have a chance to win a free Windows Phone (US only)with little effort on your part! Seriously!