2 - don't quit by closing mainwindow
3 - compile format for more efficiency
4 - more advanced search in library
5 - playlist mgmt (moving, deleting entries, clearing, cleaning ...)
8 - fetch wikipedia (artist, album, song)
10 - information related to current song (albums, related artists ...)
11 - selectable fonts (and maybe colors)
12 - more space-efficient interface
15 - split library by letters (like Amarok)
16 - architectural changes:
17 * format.py is too complicated, replace it with something
19 - it should be possible to display PlayControl in main menu, like foobar2000