1. K-Meleon
2. FastMail (okay not a program but e-mail service)
3. Anti Virus/Anti Trojan/Spyware program(s) including F-PROT for DOS, Kaspersky, NOD32

yup this browser rocks! its the only web browser on my home machine.

1. Trillian
2. PopTray
3. Openoffice.org

K-Meleon
The Bat
mIRC

JEdit
K-Meleon
Corel Draw

K-Meleon
Trillian
Virtual Dub

QCD
K-Meleon
Litestep

Eclipse
PuTTY
K-Meleon

Not in any order:

K-Meleon
puTTY
Pegasus Mail

1. AVG Anti-Virus (free for personal outside europe ex. UK)
2. Outpost firewall (free)
3. K-meleon Browser (GPL)

The Bat!
ICQ
K-Meleon

mozilla
ultraedit
corel draw

Aw, c'mon, ya gotta give me more than 2 choices besides K-M. Besides, it depends on what day, what time of day, how much coffee I've had... oh, all right, I'll try... hmmm... let's say I'm in a writing mood, I'd pick EDXOR and TopDawg.
But then if I'm in an artsy mood, the GIMP and IrfanView...
How about a Top 30?

Phew! Most things I use the most.

Perl (the only language you need )
KM
puTTY
Pegasus mail
Exdor
Synedit
FireDaemon (check it out!)
Quake2
Phone Number Cruncher (by me )
Automachron
WS_FTP
PSP7
Pirch98
PK Zip
QStat
WinAmp
Tiny Personal Firewall (Netfire for my Linux boxes)

and last but not least:

Linux

Nick

K-Meleon(tried the latest Mozilla, and it's nice and fast, but not really robust enough to make me switch from K-Meleon)

my midi synth software(can't remember the name of it, but I downloaded it one day and stuck with it)

KDE(perhaps not for windows(sob), but it's my favourite interface nonetheless, and I tend to use linux just so I can use it...It's really a tossup whether I want to use KM or KDE more... )

Havent tried k-meleon yet, but am thinking about it. Looks like the windows alternative to Galeon.

In Windows (not used much)
- Mozilla
- PuTTY
- XWin32

In Linux (used a LOT more than Windows hehe)
- Mozilla
- XMMS
- FVWM2 (a GREAT window manager. Doesnt look as slick as KDE, but it responds faster)
- NEdit (a very nice, lightweight, text editor with syntax highlighting. I use it for programming, HTML, and other stuff)
- Pico (great simple editor for config files and stuff)
- XTerm (you just can't hate the CLI!!!!!!)

Mozilla
Zinf
Trillian
Online Bible
AbiWord
OpenOffice

...and many more!