We Make Money Not Art has a great write up about Angelo Vermeulen's Biomodd game, which can be viewed from October 20 - December 1 2007 at the exhibition Multispeak in de Witte Zaal in Ghent (Belgium).
"Inspired by the case modding scene, a custom computer is built as a form of expanded sculpture. Inside the case, excess heat of over-clocked processors is recycled by an elaborate living ecosystem. The computer hardware is used as server for a new computer game. The objective of this game is to bring some of the main themes of Biomodd into an imaginative multiplayer game experience.
Both the computer structure and the game are developed with a group of biology, game and art enthusiasts. Exhibition visitors can also modify the piece: through playing they generate heat and hence influence the interior ecosystem." More at http://www.we-make-money-not-art.com/archives/009779.php