In the installation it says:

"Note: You'll still need to edit /etc/X11/XF86Config-4 to change the refresh rate or you CAN destroy your TV."

I live in Denmark where TVsets are PAL-G and use 50Hz if i'm not wrong. But how do I set this in the XF86Config-4?

BTW: I have a GF4MX440 for TV-out

Hi,
I live in Denmark too.
The easiest way to edit XF86Config-4 would be to copy the sample file and edit it for PAL:
#mv /etc/X11/XF86Config-4 /etc/X11/XF86Config-4.bak
#cp /etc/X11/XF86Config-4.sample-nvidia.tvout /etc/X11/XF86Config-4
apt-get install nano
nano /etc/X11/XF86Config-4
And edit the place where it says "NTSC" to "PAL-G"

This is taken from my mind so there may be som misspellings.