the search for extra terrisatrail intellagnce
you register, they send you a load of radio waves to check, the screen saver does the checking for you while you are away from the computor, once a unit os complete, you send it back to seti, they send you anther one and so forth, if your pc picks up anything odd you get to know about it!
how cool is that, you could actually help to find other life forms
seti@home.
I have been a member for a while and have now completed 668 units
so do take a look
one word of warning though, if you choose to have a bash at it, reduce your seti window as if you leave it on as a screen saver it can actually cause a permanant shadow on your monitor, it does still do its stuff if its reduce down though