Nice comments about Unix and Mac OS X at Unix As Literature: Revisited. There are many people like me who have been using a Mac as a front-end to a Unix machine. I actually used a Mac as a front-end to an IBM 3090 VF mainframe system for a couple of years. I wrote user guides to that system as a part of my work.

The Mac ease of use combined with the scripting capabilities of Unix is a powerful combination, even though in the past the systems have been separate. Now when Unix and Mac live together, I have arrived at $HOME.