Andrew Connell demonstrates .NET code working with SharePoint 2010 data. The related MSDN article (Accessing SharePoint 2010 Data with the .NET Client Object Model) contains sample code.
Runtime: 21min 36sec

Elijah Manor speaks to jQuery developers at the MIX 10 conference.
Runtime: 63min 43sec

John Resig presentation from the MIX 10 conference.
Runtime: 58min 47sec

Runtime: 21min 17sec

Presentation from the MAX 2010 DEVELOP conference at the Los Angeles Convention Center.
Runtime: 63min 30sec