Attempts to research this failed, so I went to National Camera and checked it out. Yes, the S30 works fine with Mac. The dozens of badly-done fake blogs selling software to allow you to copy the stuff off it are, so far as I can tell, meaningless; it works fine.
That said, it is easy to see why people would be confused, as it’s easy to plug the camera in and not see anything, or see only still photos.
What you need to know:
1. There is a camera-vs-play button; using this toggles the camera between a camera mode and a playback mode, and the latter also turns on USB connectivity.
2. USB connectivity shows only the data for the mode the camera was in; if you had it in still photo mode, you see photos, if you had it in movie mode, you see videos.
So far as I can tell, given that, the camera works fine for iMovie/iPhoto. I would know more, but I don’t have one. Someone buy me one and I’ll update this post. Thx.