Windows Summit is a website designed for people who want to build solutions with Internet Explorer 9 or who engineer and test Windows 7 PCs, devices, and software.
Microsot have posted new IE9 sessions that highlight the latest web platform capabilities in IE9. The eight presentations cover many aspects of building solutions in HTML5 using same markup and the rich features in IE9 to bring sites into Windows.
In addition to the video recording, each session includes a PowerPoint deck and code samples in the Resources section.
Here's the list of all IE9 sessions: