While hunting for a native Cocoa mp3 player (iTunes is a terrible CPU hog), I stumbled across this page which lead to me xAudic, a young mp3 player who takes up a small fraction of the cpu cycles that iTunes needs. It has it's problems, like slow loading of a large amount of mp3's, a little skipping, and it's basic visualizations hog up some serious cpu time but it's still only version 0.21. I'll run it nonstop for a few days and see how if I can live with these problems. Turning off the visualizations is a must.

The release of Emacs that dnm mentioned earlier immediately supplanted Project Builder's IDE as my development environment. Hellllo speedbar, I've missed you so.