Sometimes you just need a little instruction on using Windows...or you want to know those little secrets that make computing easier, or funner. Here are a few websites you might find helpful.
Jan's Illustrated Computer Literacy
You can even quiz yourself to see how you are doing.
Microsoft has a nice section on using some of the tools they include in the XP package.
This site is an excerpt from a newsletter from a PC Users group. It has a lot of text, but the information should be helpful.
About.com has great collections on this issue. Here is a section on customizing your windows views.