[root@fedora ~]# gnome-xgl-info 
G nVidia Corporation
0 kmod-nvidia is installed for the kernel release 1.2187_FC5
1 -accel glx:pbuffer -accel xv
[root@fedora ~]# lsmod |grep -i nvidia
nvidia               4555412  20 
i2c_core               22209  2 nvidia,i2c_viapro
[root@fedora ~]#