Eh, I'm not going to check the list that everyone has posted but here's the stuff I would include in my downlods/software.
WinRAR - Extractor/Zipper
uTorrent - Torrent
mIRC - IRC
AVG - Antivirus
Keyscrambler - Scrambles keys so keyloggers can't make head or tails of what you type.
Spybot Search and Destroy - Spyware + Adware Killer
Mozilla - Internet Browser
Skype - Not sure you'd use this, but it's a cheaper way of telephone calls.
PowerISO - You can torrent the full version, registered, but it basically allows you to mount virtual drives.
iTunes - Music listener for your iPod
Hypercam or Camtasia - Screen-capturing software
Blender 3D - 3d Maker
Pandora Recovery - Free file-recoverer, for things you've deleted.
Google Earth? - 3D map of the world
Hamachi - Person-to-person connection
Those are the main things I use. But yeah.

It's a list to think of.