There's a great new video on the MSDN web site by Richard Hundhausen that goes over the new features in Team Foundation Build 2008. It's one of the featured videos this week. The video covers the major new features and provides a great introduction to the product.
In this video, Richard Hundhausen explores the new features and capabilities of Team Foundation Build 2008, including defining and managing build definitions, agents, qualities, and retention policies.
Presented by Richard Hundhausen on November 20, 2007
Length: 14 minutes 33 seconds
You can find more Visual Studio Team System videos at "How Do I?" Videos for Team Suite.