The Microsoft pages about how to get the most out of Windows 7 are Using Windows 7 and Windows 7 Help and How to. The Microsoft pages have an excellent series of videos on Getting Started with Windows 7, which should be your first stop when you're ready to explore your computer.
The tech site Gizmodo posted about How to use Windows 7's new interface, and Windows 7, the complete guide,
Windows 7 Tour
Facilities in Widows 7
Windows 7 - Windows Taskbar
Windows 7 - Windows Search