http://help.cnet.com/9602-12576_39-0.html?messageID=2505053&tag=tip-2505053
This shows you a really cool trick for auto-renaming your files in Windows. Extremely handy for getting rid of all those picture files called "DSC20093890.jpg" etc. I just tried it out and it fixed up all my pictures in just a few minutes (and I have thousands of photos, all separated into sub-folders).
In addition, instead of "right-clicking and selecting Rename" you can simply press F2 (the standard Windows shortcut for "rename"). Neat eh?