jEdit - Programmer's Text Editor. Everything from XML to ASP. Best editor I've used.
Cygwin - I may live in Windows but it doesn't mean I have to suffer in it. Cygwin brings GNU tools to those of us stuck with a DOS 3.1 command processor. I left years ago and never looked back. I use too many things in this kit to list; from vi to fetchmail it can all be in there, pick and choose to get the build you need.
CRM114 - My anti-spam filter. Been using it for years now. As you'll see, I've gone to some effort to even get this working on Windows with T-bird.
FireFox - If you have to ask, you've been asleep. *grins*
- Sage - Nice RSS reader.
- Download Statusbar - Instead of the download dialog box, puts them into their own status bar.
- Tabbrowser Preferences - Tab browsing options and tweaks. Been using this since FF1.0.
- Adblock - Best way to block what you don't want and keep what you do.