Intel has released a new driver for Windows XP that enable the "Hardware" vertex shader. This was disabled all along and was using software based emulation.
This can give you a performance boost in several games (and allow you to play one's you could not play before, such as Battlefield 2) just by upgrading the driver. A new driver for the GM965 (Laptop version) we be out shortly as well.
For More info - http://www.dailytech.com/article.aspx?newsid=8519
Attention: Intel G965 Video Card Users - New Driver / Perfomance Boost
EternalTempest