its a cheap way of building a mini super computer on a budject! titanic used one for the special effects in the movie!
and the idea is that you link normal computers together and then somehow that increase's your main most powerful computer's speed without overclocking. a few websites that i have seen use xbox's to make a console/computer cluster.
the only problem is that i don't know ow to do this and i'm quite advanced in computer skills for my age! (13 last week!) also i just don't want the older computers to go to waste