I don't think any of us has talked about mac os x, probably because none of
the devs have one. However recent code changes have made eclihx not dependent
on windows, so it should work on mac as long as the correct path to haxe is
given in the plugin preferences.
Development has been rather quiet lately. I myself started to try some hacking
around but Eclipse dev takes a lot of time and I need to work on my own
project. I use jEdit for now....