People still using Wordpress-Pg should remove xmlrpc.php. The code from the WordPress project it uses contains flaws that could potentially be used to execute arbitrary commands on your system as the web server user.
Here's a port of WordPress for PostgreSQL for those of you that don't want to, or can't run the MySQL version. Unfortunately it's not going to be simple to make it database independent, so I'm going to have to keep doing ports for each release until the WP team abstracts things more. It's a lot of work with embedded SQL!
Well, the port is fairly complete and fairly untested. Someone needs to put it through it's paces, and I'm no expert on the WordPress code or blogging. Hopefully we'll get some users running wp-pg soon.