Originally posted by SimonmSimilar idea as Seti@home: distributed computing. There are others too, but I believe that Seti is the largest. Seti reports running at 65.14 TeraFLOPs/sec for the last 24 hours, so distributed computing has great potential.
Go on try it, it will make you feel all warm and gooey inside...
http://www.worldcommunitygrid.org/