Utilities

Rambooster - Manages RAM to make your computer run faster
Video Codecs - If you get video files that only play sound or play nothing, this will fix your problem. (Sometimes screws up Windows Movie Maker)
BitTornado - A BitTorrent client that works great. Learn about BitTorrent here.
Autoruns - Finds stuff that's starting up with your computer that msconfig doesn't.
VNC - Allows you to remotely access your computer with VNC Viewer
VNC Viewer - Control computers running VNC