It's working with the Kinect SDK (for Windows) and OpenNI. I don't know if it would run on a Mac..
You can download it from candescentnui.codeplex.com
The current SDK doesn't perform that well, because it returns no values < 800mm. But the promised near mode might improve that (coming Feb 1st).
I'm using OpenNI for the moment.
I've published a binary version of the quick start menu, you're welcome to read more on my blog: