Marc Liyanage - Mac OS X Packages - Easy to install packages for OS X; PHP, MySQL, and ImageMagick. - http://www.entropy.ch/software/macosx/
Apache Web-Serving with Mac OS X - Series of articles by Kevin Hemenway (aka Morbus Iff) on getting Apache up and running on OS X. - http://www.oreillynet.com/articles/author/779
CocoaMySQL - A MySQL GUI for Mac OS X. - http://cocoamysql.sourceforge.net/
Ginko - Objectpark's attempt at an MUA for 0S X. - http://www.objectpark.org/Ginko.html