There are a few more FReeper teams going at it on different projects.
If you are going to run a screen saver, change over to one of these distributed projects and make a difference!
Senator Bedfellow posted this almost a year ago about his experience:
I once calculated it (for Seti@home) at about $7-$8/month for for 24/7 crunching on three machines versus 24/7 idling. Of course, I drive my boxes pretty hard anyway - I do a lot of video encoding and such - so my machines are hardly idling 24/7 anyway, meaning the difference was pretty negligible in the end. I suspect that spare cycles tend to be scarcer for me than a lot of folks, but YMMV :)