phpMyAdmin and MySQL on OSX
Macservers.org has a nice article on how to configure the built-in Apache webserver, and how to install and configure MySQL and phpMyAdmin on OSX.
Some of the information in the Macservers article is out of date. I recommend getting the updated Mac OSX PHP 5.0 installer package from here. The newest MySQL package includes an installer for the OSX startup item script, so you won’t need to install the Entropy.ch one.