I like the jin-yang idea, but wouldn't go for a 1:1 copy - even with the changed colors (which I don't like). I think the letters should be easier to recognize.
Maybe something like this: www.glui.de/files/p2.png
just a first quick sketch... (the d is snatched from Dreamweaver, so this wouldn't be my actual contest submission)
............................................... sukandar kartadinata presenting the gluiph = pd on a board (including sensors and multi-channel audio) http://www.glui.de/proj/gluiph.html ...............................................