Hallo!
xgl, tuxracer and torcs didnt work, was not rendered correctly.
didn't try xgl and tuxracer so far, but torcs works normally for me ... (will try tuxracer too)
i remember hearing (on the ubuntu irc channel, so info may just be flame;) that the ati drivers where not ok...
hm ... I googled for it quite some time but with no results so far ... but I have time ... ;)
LG Georg