>MySQL and Postgres are free, last I heard.
Interestingly, a new player in the PB-class DB field is based on PostgreSQL:
http://www.dbms2.com/2008/08/25/greenplum-is-in-the-big-leagues/
Regards. Al
"Violence is the last refuge of the incompetent." -- Isaac Asimov
"Never let your sense of morals prevent you from doing what is right." -- Isaac Asimov
Neither a despot, nor a doormat, be
Every app wants to be a database app when it grows up