It will forever be a joke among the show's listeners and my other friends that I once experimented with running a cluster of 486s. (Thanks to all for only using kind humor. No one has ever been mean to me over it.)
I am not enough of a programmer to pull that off, but I had a lot of help. The link above will take you to an article at Linux.com detailing basically how mine was done, though things have advanced since then and that is reflected in the article. If you've ever had a curiosity over it, or just want to run your seti totals up, you can do this. It is not easy, but neither is it beyond a dedicated hobbiest with a friend she or he can talk into doing the heavy coding. You do not need specialized hardware or matched machines. Just a few old Linux boxes and some sort of problem to apply the finished product to.