I’m setting up my ACME environment on my new Powerbook at the moment (in my copious spare time) and am very nearly there. It’s been quite the learning experience as I get my head around the new environment, refresh my *nix skills and discover the source of the best packages of all the ACME software, plus other bits and pieces.
All of this experience will make its way into the next edition of The ACME Guide, which I plan to write over the break and release at WebDU. It will be a major update, as when it’s finished, The ACME Guide will cover setups for both a Windows and OS X environment.
If any of the Mac users out there have any specific gotchas they think I ought to include, let me know.

One gotcha is that SubVersion requires Apache 2, while the standard Apache install on a regular Mac is Apache 1.3. I’ve got the basic package installed using the package from http://idisk.mac.com/wsanchez/Public/Software/packages/, and creating two folders in /Library/WebServer and naming these as CGI-ExecutablesTwo and DocumentsTwo.