The best bit is that it really didn't take much effort to get this far (about 4 fairly lazy evenings all told). Java & OpenGL makes porting from Windows to Mac pretty trivial. A few native libraries to rebuild (and the main time with that was learning about the non-standard gcc options on the Mac) and some Microsoft-isms to eliminate (replace \ path separators with / and similar). There were a few deeper bugs that had me scratching my head for a while but nothing too nasty.
So when we've got the rendering and lipsync issues sorted out, we'll have a beta of Moviestorm for all you Mac fans out there - early October with a bit of luck.
[edit: twak] you can download moviestorm for the mac here