I just finished a page with my collected Mac OS X customizations that make working with Mac OS X a lot nicer for me.
It includes a short list of essential utilities, configuration hints, UNIX information, and a few general tips. I hope that others will find this information useful too :-)
[Editor's note: For those that aren't familiar with Marc's work, he also makes it brain-dead simple to install PHP, mySQL, PostgreSQL, and other UNIX packages. Check out his software page for the full list and instructions for each program.]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20020719084848658