http://www.infoworld.com/article/06/01/16/73777_03OPeditor_1.html
Per Zack Urlocker's blog. I noticed that Sean McCown has a blog post
that elaborates on the "problem" with open source DBMSs:
http://weblog.infoworld.com/dbunderground/archives/2005/12/an_answer_to_op.html
although most of his specific criticism is directed toward MySQL.
-Neil