I've added it and this is the answer when I do "startx":
(WW) NVIDIA: Chipset "GeForce2 MX/MX 400" in Device section "Card0" isn't valid for this driver
(EE) No devices detected.
Fatal server error:
no screens found
The nvidia driver works (or it seems like so) but it doesn't load at the startup. Aboute the devices...which devices are not detected? all? the monitor? I'll go on trying it and I'll let you know. If you find some mistake in the configuration file please tell me.