Recently, I wrote a user script to resolve download link for Channel9 site, you can simply list all available links in a Channel 9 page: http://channel9.msdn.com/
1. Install Script Extension for your Web Browser
2. Open a video page in Channel 9, for example: http://channel9.msdn.com/Blogs/Windows-Phone/Coding-Basics-and-App-Creation-Part-1-
3. Click the “Resolve” button below the video area
4. Enjoy it!