With the releases last month of the xf86-video-intel 2.11.0
DDX driver and the Mesa 7.8
graphics stack, Intel has updated its quarterly Linux graphics package in which it recommends versions of several key components for the ideal Intel experience.
Intel's Q1'2010 recommendations include xf86-video-intel 2.11.0, Mesa 7.8.1, libdrm 2.4.20, the Linux 2.6.33 kernel, and X Server 1.8.0. Also being recommended by Intel is Cairo 1.9.6 and Clutter 1.2.4. The recommendations can be found on the Intel Linux Graphics web-site
Most distributions like Fedora 13 that are updating around this time are shipping with packages similar to these recommendations. Ubuntu 10.04 LTS though is using Mesa 7.7, the Linux 2.6.32 kernel (but with the 2.6.33 DRM back-ported), and the X Server 1.7 series.