Simplicity at it's finest... It would be nice to generate a playlist from a single command line. Then one could wrap their own script around it to build multiple playlists.
$ playlist.pl --mp3dir /music/metal --makerandomplaylist HeavyMetal.m3u
$ playlist.pl --viewplaylist HeavyMetal.m3u
An open, cross-platform journaling program.
A scientific plotting package.