0.0.2
mpeg4 support (FAAD)
shorten support
hotkeys for next/prev/stop/shuffle/repeat & info window

0.0.3
Stream support for shoutcast/oggcast, or just opening files via URL.

0.0.4+
A queue system, in which a user can option+click a song, and it will be placed
  in a queue, whcih will pick the next song.
Audioscrobbler.
look into realplayer (cook in mplayer) and wma
visualizer? (libvisualizer perhaps?)