Why Not MySQL?
    http://openacs.org/why-not-mysql.html
MySQL offers lighter database fare, but it may leave some users hungry 
    http://www.zdnet.com/enterprise/stories/linux/news/0,6423,2436155,00.html
Evaluating postgreSQL for a Production Environment
    http://www.medasys-digital-systems.fr/mirror/linux/LG/issue36/defurne2.html
Academic's Tool Grows Up - PostgreSQL
    http://www.32bitsonline.com/article.php3?file=issues/199912/pg_sqledit&page=1
Open Source Database Routs Competition in New Benchmark Tests
    http://www.greatbridge.com/news/p_081420001.html
    More info about the benchmark:
        http://www.greatbridge.com/news/p_081620001.html
    Update 8/22 wrt MySQL Tuning:
        http://www.greatbridge.com/news/p_082220001.html