Open Source Software
Pygme
Pygme is a GTK2 based MPlayer frontend in Python/PyGTK. I wrote it in the summer of 2005 with audio and video songs in mind (as opposed to movies). Here's the link to pygme's homepage. Pygme is available under the GNU GPL (Version 2) License.
I have more or less given up on Pygme's development. There isn't much one can do with the current state of mplayer's slave mode. There's no way one can get information from audio and video files without duplicating the work already being done in mplayer. Moreover, other software utilities like eyeD3 (which I used to get ID3 tag information and bitrate for mp3s) are just not robust enough and frequently give exceptions for files that work just fine in mplayer (or WinAmp).
Meghadoot
Meghadoot is a hybrid wireless network architecture for Ad hoc wireless networks. Here's a link to Meghadoot's project page.