The frame-rate for Doom 3 on the GeForce GT 220 shoots up by 32%, but it is still a ways off from the NVIDIA driver. This was a stock Mesa build without S3TC or floating-point textures.
The Nouveau Lightsmark performance went up by 47%.
The Warsow frame-rate goes up by 32%.
The OpenArena frame-rate is up by 30%, which puts the open-source Nouveau driver as running at almost 90% the speed of the official NVIDIA Linux binary GPU driver.