Thanks to Mictlantecuhtli, for making this post here, where he draws our attention to the fact that Windows 2000 Service Pack 4 has now been released.
You go can here for the fixlist, which includes a wide range of bug fixes, security fixes, etc.
I don't see anything on the Official Microsoft Site, but I am sure that that's on its way.
As always, its recommended that you backup your existing configuration before applying service packs, especially if its on a mission critical server.