We have been running Vista live meeting sessions which covers various topics around Vista.
Here is the link to recorded Vista live meeting sessions.
Vista Overview for Developers
A Lap Around Windows Presentation Foundation
Advances in Document Workflow
Animation, 3D and Media: Unlocking the Power of WPF
Windows Applications in a Mobile World
Windows Vista – Application Compatibility Issues and Resolutions
Developing Power-Aware Applications
Behind the Scenes: Recent Changes in the User Experience
Search & Organize in Windows Vista - An Architectural Overview
-Suresh