From the almighty Scott Hanselman:

Released today are four new screencasts about the ASP.NET 3.5 Extensions by various members of the ASP.NET team. Every video is available in numerous formats, and note that this also includes re-encoded versions of my Intro to MVC Screencast in a pile of formats including an iPod/iTouch compatible format, as well as ones for the Zune and PSP and a utterly unwatchable 40 meg 3GP one for 3G Phones.

Continue reading here (includes links to the videos).