(if you're a tech geek, mind you)

  1. Cached jpegs and gifs from all the sites you visited recently, or not-so-recently...
  2. ...Not to mention the HTML files from those sites
  3. Microsoft Word's Undo file
  4. The Windows INF folder
  5. DLLs that aren't being used, inside the Windows System folder
  6. Your boot log (BOOTLOG.TXT)
  7. A copy of the installation log
  8. Folders you intentionally marked "hidden." (Naughty, naughty)
  9. Folders you didn't know existed (like the Windows Update folder) </ol>

Previously: No Subject