Ok, I got it working earlier this afternoon. The FC3
system-config-display program they provide is crap, even after I
installed the updated RPM. Despite making any changes to the xorg.conf
file, it just sits there all dumb like it's going through the motions,
but never changes anything. So I actually deleted the xorg.conf file,
killed/restarted X, and let it figure out what the heck was going on
from scratch, and it worked. Looks like I was missing the "Screen 1"
option, as opposed to Screen 0, associated with the 2nd video driver
section of the xorg file. I pretty much copied this info into my MDK
10.0 XF86Config file, and it works there as
well.