The folks at Server Logistics have put together native Mac OS X package installers for many commonly used server tools, such as Apache 2, PHP, MySQL, and Tomcat. These installers should make it easier for people approaching these technologies for the first time, since these installers appear to obviate the need for cryptic Terminal commands. These packages even include System Preference panes for performing several useful functions, such as starting/stopping MySQL and Tomcat.
Package installers for other tools, such as PostgreSQL, OpenSSL, and Apache Cocoon are also available. [Thanks to Greg Stasko for the submission.]