The tutorials here (Seven Forums Tutorials) are very useful and easy-to-understand! If you have a need to learn a certain aspect of Windows 7, I recommend searching through the tutorials here.
Also, check out this Windows 7 Online Training from Microsoft - Windows 7 Online Training | Learn | Channel 9
. It gives you more of an overview and then you can pick and choose what you want to learn more extensively.
Hope this helps!
Microsoft Windows Outreach