I Heart Foobar2000
Too bad it ain’t open-source, but it is amazing as it is in its free as in beer state.
Just switched to using DarkOne theme for foobar2000:
Download and follow the instructions closely from here.
Also, found a really nice Windows 7 Shell integration plugin.
And… Fresh off the compiler, looks like the same guy wrote a Apple Remote Protocol Implementation as a Foobar2000 plugin… (!)/
It’s still a bit rudimentary, but now I can control my foobar from the iPhone with the Apple Remote app.