Video Downloader

This Firefox extension lets you freely download videos from Youtube, Google, Metacafe, iFilm, Dailymotion and 60+ other video sites, plus all embedded objects on a webpage (movies, MP3s, flash, QuickTime, etc) -- directly! VideoDownloader adds a small icon on the status bar at the bottom of your Firefox window, and a toolbar button. Just click that and download the video you are watching.

https://addons.mozilla.org/firefox/2390

Speed Defrag

Speed Defrag optimizes Windows XP defrag. It restarts your computer which refreshes the ram and then loads only the defrag.exe program. This imposes a minimum load on system and therefore defragmentation speed is increased. This program will also shutdown or restart your computer automatically once defrag is over.

http://www.vcsoftwares.com/SpeeDefrag.html