NVidia driver cause openSUSE 11.0 become bold

Try a different theme. I too have noticed the nvidia driver can cause a change in the font appearance.

For me with KDE3 I prefer Theme=Plastik, Widget Style=Plastik, GTKStyle = Clearlook. Play a bit, I think it quite likely with a bit of perseverance, you will be able to tune it to be just as good, if not better, than what you had before. That was the case for me.

I also ensured that I had qtcurve for kde3 installed. I think that is installed by default for KDE3 in openSUSE-11 but I had to install it specifically for openSUSE-10.2 and 10.3.