I looked at my other Slackware 12 boxes, the fonts lists under /usr/X11R6/lib/X11/fonts are almost identical to the ones on the new install.
For the fonts in applications, I will change the application preferences to get fonts that look OK.
For the fonts in menus of X applications, the only place I know where I can look is xorg.conf. Changes in the X config used to work for me in the past, but don't seem to work now. If there's any other config file that affects the look of X apps, I'd appreciate some info on its location.