I have written about GLAMOR dozens of times on Phoronix as its advanced a great deal since being started a few years ago for carrying out 2D acceleration via OpenGL without having any GPU-specific code. GLAMOR is mandatory for acceleration on the Radeon HD 7000 series and newer hardware while its complementary to EXA/UXA/SNA for other drivers and hardware.
Intel has been making a lot of improvements to GLAMOR with merging it into X.Org Server 1.16 for release this summer. Just earlier this week I wrote about GLAMOR's DRI3 and Xephyr support.
For those interested in more background development information on GLAMOR for the X.Org Server, Keith Packard is out with a rare blog post. The post is entitled GLAMOR hacking and covers some of the work he and Eric are doing for improving this acceleration method within the X.Org Server to make it fast, reliable, and universal to all modern OpenGL-supported hardware.