Is D 2.0 available on Mac OS X? OS X 10.4 at least. OS X 10.5 would be fine. Both is preferable. I don't care about 10.3 or earlier. Xcode integration - I don't care, since I use Vim and Make. But I expect the majority of folks to prefer integration to some version of Xcode... 2.4, 2.5 or 3.1.