Useful and cool Windows downloads

Some Windows downloads I've discovered recently (all free unless noted):

• Ccleaner - cleans out Windows system temporary files, browser cache files, and other garbage
  
• Copernic desktop search - indexes your hard drive so it can be searched easily (I was interested in being non-Google centric)
  
• Gaim - open source instant messanging client, an alternative to the ad-filled AOL Instant Messenger
  
• HDD Health - check your hard drive status via S.M.A.R.T.
  
• iColorFolder - color code your virtual folders on Windows
  
• O&O Defrag - a much better defragmenter than the one that ships with Windows XP (unfortunately not free, but there is a 30 day trial)
  
• Stamina - a touch typing tutor (I've been using it to learn Dvorak)
  
• Mars Exploration Rover Screensaver - nifty photos from NASA