A Hacker's Guide to QuickTime (20,509)
A page explaining how to get the most out of QuickTime; not really a "hacker's" page in the "black-hat" sense of the word...
Brian Hill's OS X Software (20,462)
Brian has developed a great collection of useful programs that put a GUI around old-style UNIX commands. These include xfiles (set UNIX file permissions visually) and brickhouse (firewall configuration). Highly recommended!