I'm working on a couple of hacks right now. The first is a patch to Nautilus to allow file-deletion , moving of files to the trash, from the Music View. I found that with the various mp3's I download from napster or gnutella, I quite often end up with incompletes. With a Music View that allows you to delete files, you can easily hear if the song is complete or not and then optionally delete the file.
The other hack which I haven't started yet, but I want to soon, is an importer for gnome-cal calendar data into Evolution.
Unfortunately my extra time is limitted lately. Hopefully that will change soon.