Start Youtube link at a particular time

http://youtubetime.com/

If you leave dozens of browser windows open, and commonly restart them all when the browser restarts and asks, this is a neat trick to stop the YouTube videos from all launching at once.  You can add "&t=9999s" onto the end of the YouTube links.  So for example
  http://www.youtube.com/watch?v=q62lVpfn1uI
becomes
  http://www.youtube.com/watch?v=q62lVpfn1uI&t=9999s

You can also use this to send a YouTube link to that jumps right to a particular minute and second such as
  http://www.youtube.com/watch?v=q62lVpfn1uI&t=1m8s

Keeping large AVI media files from being in use

http://tweaks.com/windows/36849/remove-image-andor-media-preview-in-explorer/

XP will maintain a lock while it generates preview information.  Trying to move or delete a movie file but it says it's in use? Happens a lot? Try unregistering the shmedia.dll.
  regsvr32.exe /u shmedia.dll
or to re-register
  regsvr32.exe shmedia.dll

Similarly, you can disable and enable thumbnails for images.
  regsvr32.exe /u shimgvw.dll
  regsvr32.exe shimgvw.dll