Pseudo, shareware by Brian R. Hill, launches Aqua applications as the superuser or root.
Admin.com is the companion site to
UNIX System Administration Handbook,
by Evi Nemeth, Garth Snyder, Scott Seebass, and Trent R. Hein (Prentice Hall, 2000).
This link will bring you to “Mac OS X 10.0: About the root User and How to Enable It” from Apple’s Tech Info Library.