Official Kinect drivers now available for Windows and Ubuntu
OpenNI aims "to accelerate the introduction of Natural Interaction applications into the marketplace," and releasing drivers is a good first step. Binaries for 32-bit Windows and both 32 and 64-bit Ubuntu systems are available for download and source code is also available. There's also a full OpenNI user guide in PDF format.
Here's hoping driver availability leads something more than slick demos -- we'd love to actually be able to control our desktops this way.