65 playstation 2s as a linux computational cluster

just as the title might indicate, i have no idea what this is good for.

The NCSA has constructed a PlayStation 2 Linux cluster as a test bench for scientific computation on "toy" hardware. The cluster consists of 65 compute nodes, 4 user login and development nodes, and 1 prototype node for software installation tests. All the nodes run the Sony Linux distribution for PlayStation 2.

maybe this page will clarify things for you. i'm still in the dark, but that rack of ps2s looks cool...
(thanks, sizod.)