Here’s a nice collection of webcasts on Windows 7 that you should find helpful.

Windows 7: A First Look for IT Pros

TechNet - Windows 7: Troubleshooting and Support

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TechNet Video: Troubleshooting Windows 7 (Level 200)

TechNet Webcast: Windows 7 Feature Overview (Level 200)

TechNet Webcast: A Tour of Windows 7 (Level 100)

TechNet Webcast: Windows 7 Enhanced Security and Control (Level 300)

Several other Windows 7 webcasts