some tests from tweakers.net
tweakers.net has tested again the performance of PostgreSQL 8.2-dev and Mysql 4.1.20 and Mysql 5.0.20a. Results are nice and shown here.
Best thing: the collapses for requests per seconds if Mysql has a concurrency greater than 7. Oh, and by the way, they don't state the table type for Mysql so we don't know, if it is the fast and forgetfully MyIsam or the better but slower InnoDB type.