And for the competitive among you, just returning ONE work unit boosts you up to the 32nd percentile.
Yep, almost 1/3 of people who signup never return a work unit. Then there are the people you'll see in the lists on the site who have done 100 or more, and some thousands of work units. My brand spanking new Duron 800 takes about 10 hours of undistracted processing time to do one work unit. I can't imagine the home networks that some of these high-volume people contributing from "home" must be using. They must have banks of Athlon or P III machines hooked up and dedicated to SETI@HOME.