For Any User

Firefox
A very standards compliant, secure, and extensible web browser.

GMail
An online email client.

7-Zip
Archiving tool.

K-Lite Codec Pack / Media Player Classic
Player for video

TiddlyWiki
a reusable non-linear personal web notebook

KeePass/KeePassX
The open source password safe. Can auto type passwords in many cases. I use keep this on my AES encrypted USB thumb drive so I have the same access to machines no matter where I go.

Audacity
For simple audio editing. See Wav To Mp3

MediaMonkey
Much better library support than Winamp.

FileZilla
Ftp Client

PureText
Removes formatting of the text in the clipboard.

CrossLoop
A program that will allow me to control your computer if you need help.

SharpReader
A news/RSS/ATOM aggregator. That basically means that I can keep track of things like dilbert cartoons without having to supply my email or create an account.

CDBurnerXP Pro
Free Burning software for XP.

Ditto
Clipboard history program

Miranda
Instant Message Client. - stopped working - use GAIM.

For Developers

JEdit
Programmer's Text Editor

SquirrelSql
Universal SQL Client

Resin
Java Web Server

Tomcat
Java Web Server

SliceHost
XEN Based Virtual Dedicated Server

Putty
SSH Terminal. See RSA Authentication.

WinSCP
Copy files through SSH.

http://unxutils.sourceforge.net/
Unix Utility Commands

Mercurial
Fast, Portable, distributed source code management system.