Thanks to those of you who made it to the Windows Phone Camp in Sunnyvale, CA on October 20 & 21, 2011. My talk was Building Windows Phone 7.5 Apps with Silverlight, and the slides are below. For those of you who couldn't make it in person, you can watch the video online.
Be sure to download the free tools from http://bit.ly/wpgetstarted. You'll get Visual Studio for Windows Phone, Expression Blend, XNA Studio, and the emulator. Everything is free, and you don't even need a device to start developing. That link will also show how to get started after you download the tools.