The stuff you use every day.
Ever wonder what programs people use the most? Here's mine, what about the rest of us.
zsh -> my shell
aterm -> my terminal emulator, konsoles transparency is sorely /lacking/ outside of KDE.
window maker -> my desktop quite literly you could almost say lol.
vim -> text editor slash word processor slash code editor slash web site maker
less & grep -> my pager and searcher combo
flock -> web browser (linux version), which I usually keep a running session of handy.
squirrel mail -> my mail user agent via webmail [www.ippimail.com]
latex2e/friends -> any thing I write that ain't in HTML, Plain Text, or a date with the CPU.
MPlayer -> Video and 'radio', I use konqueror when I want the plugins ;-)
Amarok -> Music collection browser and player
language of the season -> depending on whatever I'm working on I often rubber band between C, perl, python, irb, sh, etc. What ever I'm using at the moment tends to fill the gaps in between tasks.