A lot of learning videos published in Channel 9 about Windows 7, as you can see in this link. For developers, I would like to recommend the following for your first introduction to Windows 7. It doesn’t mean that other videos are not interested, but for your 1st intro, you should consider these:
Mark Russinovich: Inside Windows 7
Technical Fellow and Windows Kernel guru Mark Russinovich, he enlightens us on the new kernel constructs in Windows 7. One very important change in the Windows 7 kernel is the dismantling of the dispatcher spin lock and redesign and implementation of its functionality. The direct result of the reworking of the dispatcher spin lock is that Windows 7 can scale to 256 processors. Windows Memory Manager even more efficient than it already is. Native support for VHD (boot from VHD anyone?) is another very cool addition to our next general purpose OS. A lot!
Soma on Visual Studio for Windows Azure, Concurrency, and Windows 7
He talked about key announcements for PDC and how his team is building tools for Windows Azure, tools to simplify building concurrent applications and tools to take advantage of new features in Windows 7.
What's New with user32 and comctl32 in Win32
Raymond Chen is a legend in Win32 (The Old New Thing). He has been involved in the evolution of Windows for over a decade. In this videos you will hear about the lowest level user interface components (user32, comctl32) that appear in almost every Windows application. You will learn about "recent" changes and enhancements in these subsystems, plus be subjected to some philosophical musings on how foreground activation is like love.
Design Principles for Windows 7
Samuel Moreau introduced Windows User Experience Principles approach to shipping software. Along the way he shared stories and lessons learned along the journey of designing the user model and experience for Windows 7, and leave you with a set of principles that you can apply as you build your applications for Windows.
Web Services in Native Code
I like this one. Windows 7 introduces a new networking API with support for building SOAP based web services in native code. Nikola Dudar talks about the programming model, interoperability aspects with other implementations of WS-* protocols, and demonstrates various services and applications built using this API. He is a program manager on Windows Networking team.
Of course, a lot more things are interesting and I will keep you know!
Hope this helps – RAM