http://www.redhat.com/software/rhel/
http://itpro.nikkeibp.co.jp/free/ITPro/USNEWS/20030313/6/
http://slashdot.jp/article.pl?sid=03/03/13/0333240&topic=61&mode=nested
http://slashdot.jp/article.pl?sid=05/02/16/0356231&topic=61&mode=nested