The idea of coaxing multiple machines to gang up on one graphics-processing job is old; but the feasibility of configuring such a system on a shoestring budget is rather new. With open-source solutions proliferating on the Web and businesses kicking decent PCs to the curb like so many red-headed stepchildren, money’s no longer an obstacle. Only one question remains, really: Are you a big enough geek to put it all together? Link.
Build Your Own Render Farm