XAMPP for Mac OS X is the simplest, most practical and most complete webserver solution for Mac OS X. The distribution includes an Apache 2 Web server, integrated with the latest builds of MySQL, PHP (both 4 and 5) and Perl. It comes as a Mac OS X Installer package which contains all the necessary files and requires no dependencies.
If you are an experienced Web developer or a Mac enthusiast who needs to run a webserver, create dynamic webpages or use databases, this is your lucky day!