I was about to make a similar post, after seeing someone mention it in nvnews forums.
I decided to take a look at the nvoglnt.dll for the 52.16 drivers, and it seems that there's NV_vertex_program3 and NV_fragment_program2 stuff, along with a few non-listed extensions (in the extension registry) WGL_NV_swap_group, WGL_NV_float_buffers..
nb. this is the same as what NV30 emulation was in older drivers..
