http://www.beowulf.org/
http://hotwired.goo.ne.jp/news/news/culture/story/20040817202.html
http://slashdot.jp/article.pl?sid=04/08/18/0354244&topic=2&mode=nested
http://hotwired.goo.ne.jp/news/news/technology/story/20030714303.html