Holy...when I was working at my last job (a financial software startup), I joked to my boss that we should port our software to the PS3's GPU and run a cluster of PlayStations. The math in quantitative finance is rather similar to the sort of massively-parallelizable vector calculations in computer graphics. Plus, I had this amusing image of hedge fund managers slaving away at their Dell workstations while the PlayStations were all locked in the server room, crunching numbers.

I'm impressed that someone actually did it, which goes to show that there's no idea too crazy to implement.