- shortcuts
- don't quit by closing mainwindow
- compile format for more efficiency
- more advanced search in library
- playlist mgmt (moving, deleting entries, clearing, cleaning ...)
- multiple playlists
- queueing
- fetch wikipedia (artist, album, song)
- show stats
- information related to current song (albums, related artists ...)
- selectable fonts (and maybe colors)
- more space-efficient interface
- spectrum analyzer
- tagger
- split library by letters (like Amarok)
- architectural changes:
        * format.py is too complicated, replace it with something
          simpler and cleaner
- it should be possible to display PlayControl in main menu, like foobar2000