Phoronix: A New Acceleration Architecture For X

XAA, or the XFree86 Acceleration Architecture, is over twelve years old and finally in 2005 it was greeted by a replacement, EXA. XAA is nearing an end-of-life and Intel is prepared to remove XAA acceleration within their next Intel graphics driver release later this year...

http://www.phoronix.com/vr.php?view=NjY0MA