PhoenixWright: foobar2000 with some theme additions.
Been meaning to try this one.
Songbird sucks, only works on Windows well.
Exhaile rocks but is spare in features and only really works well under Gnome in Linux.
Banshee is a crappy, crappy app (Mono, need I say more?)
Rythmbox is alright, iTunes clone, but I think you need Gnome for it as well.
I won't use iTunes.
I tried Jaangle but either it sucks or confused me, not sure which, but didn't like it.
I'm set on a Linux box, I'll happily use Exhaile, I just don't have a good Windows media player (not a big fan of Winamp, but need more than VLC).
KavazovAngel: Music-related stuff that I use...
FL Studio - obviously, for music production (taking a break from right now, gotta focus on university first).
Ableton Live - for making sets, compilations, mashups, simple remixes, cuts and other similar stuff.
Sony Sound Forge - for making some small edits to some tracks, using it together with Live and FL Studio.
Exact Audio Copy - for ripping CDs. Connected with LAME, for making high-qualty 320kbps MP3s from the wav files for use in my portable devices.
FLAC - for decoding FLAC files, I don't encode into FLAC, though. Like my music in wav (for lappy playback and archiving) and mp3 format (for portable playback).
Windows Media Player, for everyday playback of the music.
EDIT: Forgot Mp3tag, which I use to add tags and information to the MP3 files.
EAC is the bomb for ripping. It samples over and over again until it gets the sequential identical reads. I've ripped some screwed up CDs with this. It also supports tagging and will offload encoding to LAME (even passing tagging info to it for you).