I’ve created a working version of Dwarf Fortress for Mac OS Lion. This fixes the launch error that made it unable to open in OS Lion, using a fix that was being passed around the Web. This is the latest version (at the time of this upload), 0.31.25
I’ve made two versions, one of the regular version, and one with the Mayday graphics pack pre-installed.
You can download the regular version of Dwarf Fortress (works in OS Lion), here.
You can download the Mayday version of Dwarf Fortress (again, works in OS Lion), here.