> I made a fresh install of Slack 10, and copied an old TrueType fonts
> directory that I used with Slack 9.1. I included the path in
> /etc/X11/xorg.conf,

Did you setup /etc/fonts/local.conf?
That is the Fontconfig/XFT config file, and all the up-to-date Linux
software use that system instead the legacy X11 fonts.

> like I always did, but after reopening X the fonts
> look terrible.
> The fonts *are* loaded and in the normal size, but they are looking
> very ugly in Mozilla, xmms, etc.

xmms sucks, like other gtk-1 programs it doesn't use the Fontconfig/XFT
system and can't really support a modern internationalized Linux desktop.

--
дамјан

I believe the technical term is "Oops!"