01 8 / 2012
It’s working with mountain lion, but as @cdeliens said, if you use MAMP Pro you’re no longer able to use port 80.
I upgraded mountain lion yesterday and update mamp pro to latest 2.1.1 today, then I ended up with error “Apache wasn’t able to start. Please check log for more information.” all the time.
The problem is fixed when I changed all ports to MAMP Ports (8888,8889,8890). I’ll wait for official fix from MAMP dev