If you like Python, our group just released PyKinect which enables you write Kinect games/apps using Python as the name suggests (note: CPython, not IronPython). You can check it out at http://pytools.codeplex.com and click on the PyKinect link. (disclaimer - msft guy)
It's a wrapper around the Kinect SDK, so not in its current form. But being OSS & Python, anyone can take it & massage it into something similar for Linux/Mac Kinect libraries.
