I had known that SUSE 10.1 had working 3D acceleration for the Intel GMA chipset, but couldn't figure out how to get the spinning cube going until almost 2 weeks ago when I read the correct instructions in Chris Brown's SUSE Linux book from O'Reilly.
I love the transparent window effect in Xgl. Holding down the Alt key and scrolling the mouse wheel adjusts the amount of transparency. Very cool eye-candy!