The Entire skybox is PS2.0 as is the water
3dmark2003 barely use PS2.0/VS2.0 as much as 5%?
-- by my reckoning virtually every pixel would have been touched by a PS2.0 shader at least once per frame!!
FYI, if anyone's interested I've got some zoomed shots looking at the precision under the two versions of 3DMark on both an NV35 and R350: