Apple shut down today their Open Darwin site after four years of operations. It was originally set up to develop a derivative, standalone OS from OS X using it's UNIX base. It has failed (from lack of third party developper interest IMHO). Hopefully this isn't the end of the "open source" Darwin base for OS X though. Watch this space, I'm sure there's going to be quite a bit of renewed speculation, especially with Leopard being announced soon.