Ok, here is everyones chance to advocate thier favorite progs for linux. Go with source or rpms or whatever, and if you think its particularly great, include a link. Tell us what you like!
hmm good idea :
-> best x chat client, bitchx is the best on console i think.
-> nice burning program, can decode and burn mp3s on the fly
-> claws branch of sylpheed, very good email / news reader
-> online role playing game
-> for mp3s ...
My all time favorite Linux app....
KDevelop, KOffice and XMMS
Electric Eyes and GQView for image viewing, GIMP for image manipulation, Konqueror for web browsing, Kate for text editing, KDE for a WM/DM, Noatun for MP3s, and KDict is kind of nice.
Well I don't use a lot of apps on my linux system but find comes in use quite a bit!