Here is a linux forums article on what XGL is all about. Good stuff!
BTW, tried it on my old Athlon – no go. I don’t have SSE on that chip. I thought it was a Duron, but it turns out that it is a Thunderbird core. This was the first Athlon for Socket A and the last to not have SSE 
. The old box is finally showing its age (Ah, but, it can still do a mean Mame of Bubble Bobble!).
I then tried it on my dell with the P4 and the Nvidia 6600 GT. It ran Kororaa and X at 1920 x 1200 without breaking a sweat 
Too bad. This box is for windows only.
Gotta try upgrading the ole Athlon to see if this will run