Is there a list of commands unique to the OS X terminal? I tend to find out about unique OS X terminal commands piecemeal. As problems arise, or as I read askdifferent, I'll find out about handy things like mdls and mdfind.

Is there a place that lists all the unique OS X commands and gives me an overview of what they do?
Check out the Unix Commands Unique to Mac OS X / Darwin page by Matisse Enzer. It's not current (OS X 10.4.2, August 2005), but it's pretty good.

Edit: @bmike said to me things sure have changed since 10.4 so here's hoping he's got a more up-to-date resource! :)