Many security professionals tend to use OS X systems. Maybe for the nice and shiny looks, or the Unix under pinnings that make it a great platform to run current tools. However, the operating system itself isn't exactly secure out of the box and like all operating systems can profit from some additional hardening tricks.
I have recently looked over a number of OS X hardening guides, and found that not many specifically address the latest version of OS X (Lion, 10.7), nor are they necessarily well maintained. Instead of coming up with another (soon to be outdated) guide, I am trying to come up with a meta guide. If you know of a good hardening guide for OS X: Please let me know. Also, if there are any tricks that you find useful (or things that fired back and didn't work at all): Let me know too.
Most notably: Apple released a guide for each version of OS X up to Snow Leopard, but I can't find one for Lion. Does it exist?
Here are some of the guides that I have sound so far:
Center for Internet Security:http://benchmarks.cisecurity.org/en-us/?route=downloads.browse.category.benchmarks.os.unix.osx
Johannes B. Ullrich, Ph.D.
SANS Technology Institute
(c) SANS Internet Storm Center. http://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License.