I installed the new drivers and without tweaking saw a 3dmark3001SE score increase of 400 points. Not a massive increase, but measurable. No other tweaks done, just reboot, run 3dmark, reboot, install via drivers, reboot, go through detected new hardware, reboot, run 3dmark.
From 4287 to 4688 with athlon 1.4, 512 meg DDR, GF2 Pro.