While the exciting driver developments are now in the new 310.xx Linux driver series as of this week with new capabilities like OpenGL 4.3 compliance and threaded OpenGL optimizations, the 304.xx series is still the current officially supported / stable version. Furthermore, the 304 series is the last of the line for some NVIDIA hardware.
The NVIDIA 304.60 certified Linux driver that was released today fixes bugs concerning the X.Org Server, RandR, OpenGL stereo, exposing GPU memory utilization information, support for the RandR backlight output property, a Unity launcher bug-fix, and various other fixes. So the 304.60 update is mostly a bug-fix release, but there's also a couple extra features that were introduced too.
This latest NVIDIA Linux driver update can be downloaded from NVIDIA.com.