I've been experimenting with Fischer Chess a little bit. That is to say, I've been setting up some of the 960 variants manually.
If we want to make it avaliable on chess.com, we need to find out three things: Who has access to the code for the Chess.com engine. Who could alter it to implement it (probably a relatively simple task for someone with knowledge of Java, which I presume is the language it's based on). And finally, who are the administrators willing to make it happen.
I think it would be a valuable addition to the site. We should make direct contact with the admins and ask them.
I'm actually working right now as a Java Developer university co-op student. If it's not too difficult, and the basic code for the chess engine is provided... I could take a stab at creating the coding logic based on the wikipedia logic. I can't guarantee I'll be successful, but it'd be interesting and I wouldn't mind trying.
Nice idea. It would be kind of cool to try it out. I wrote a blog about it at http://blog.chess.com/kurtgodden/fischer-random-chess