Wow, I had just recently switched to foobar2000 and vlc. The best part about foobar is that I could match the Musicmatch library functionality with a couple plugins and some tweaking, but without the horrible Musicmatch bloat.
Songbird is still way too early in development to be a serious consideration. It's bloated, slow, and a resource hog, and it's only on like version 0.3. The blog searching capability is pretty cool, though, for finding new music, but I imagine once they're big enough, the RIAA will sue them into oblivion for it.