Wow, it looks good! I like the music too, especially how it syncs up with the video. The distortion of the windows is a little trippy, though; rather than just look like they're rotating and moving through space, they look like they're skewing a bit too.
Not sure if "Hotkey assignment" is a particularly engaging feature to show off, though. Maybe something more generic about the flexible interface... Also, don't forget to advertise that it's open source!