OS X has always been an interesting to me. It's almost unix but not quite and unique enough under the hood that it bears looking into. For years I've been meaning to get off the user only side of OS X and start getting into the internals of the beast. As a first step I'm looking at hardening guides.
So far I've found
Update:Found another OS X hardening guide here cannot remember the original link but I think I got it through SANS.
If you have another guide let me know.