Music: amaroK (JuK comes with KDE, not amaroK)
Video: MPlayer, or various xine wrappers (Also, Linux RealPlayer is extremely well behaved)
IM: Kopete
Web: Mozilla/Firefox, Opera
IRC: X-Chat, for now anyway...
Torrent: Official Client, Azureus
Emulators: ZSNES, FCE Ultra, Gens, XMAME, dosbox
CD/DVD Burning: K3B
Quick Audio Editing: Audacity
More Pro-level stuff: Audour, Rosengarden
Image editing: You're kinda stuck with The GIMP on this one, unless you have Win4Lin with Photoshop or something.
Possibly cool program I haven't tried: Komposé(as in Exposé).
Video Card not to have: Radeon 9600 or newer.
NO. I've used mplayer for almost a year. I dismissed Totem and some more Gnome stuff as bloated but Totem has a crapload of things. It's so easy and fast. It may not have the stuff mplayer has, but it has tons of features.
Totem's just another xine wrapper, and xine doesn't have as much or as good of codec support. Of course, it does do DVD menus so that's a plus.
Also, Totem uses GTK2. Mplayer uses... well, it doesn't use GTK2, so the style looks real bad and it doesn't seem to integrate with Gnome. Which I have a real problem with.
No less than XMMS. Both have skin GUIs, although I personally just associate movie files with the commandline(and have controls set up on my mouse and remote control). BTW, the keyboard controls(space=pause, arrow keys=seek) ALWAYS work.
KDE programs don't use GTK2 either, but Qt. Qt = lame.
:lol