Phoronix benchmarks the latest Gallium3D driver for Linux, you can check it out over here.
"As noted last week on Phoronix, Google has Chromium OS
engineers making improvements to Intel's Gallium3D driver even though
this open-source Linux driver isn't officially supported by Intel Corp.
Google's interested in shipping the Intel Gallium3D driver on their
Chromium OS netbooks in order to take advantage of the Low-Level Virtual
Machine (LLVM) and other Gallium3D features to make up for the netbook's
lack of vertex shader hardware. How does this community-maintained Intel
3D driver now compare performance-wise to Intel's official classic Mesa
driver? Here is a fresh set of benchmarks from the latest Mesa Git code
over the US holiday weekend."