*humms softly* Ok. Well, I know next to nothing about this, but why would you be running a copy of xfstt?

I found a linux version (http://www.ibiblio.org/pub/Linux/X11/fonts/) which indicated you replace the xfs and mkfontdir with new binaries, and then restart, using them.

...gimp, etc. at least, should be able to use fonts if the x font server is active and working correctly (are you sure it is?). If all else fails, you could also try the gimp-freetype split from CVS (http://sven.gimp.org/freetype/) which includes support for true type fonts (manual load or something similar I presume).

Finally, possibly this article set will help you:
http://gnome.themes.org/themes/965/

Note especially the ones at the bottom: "can''t install fonts" and
"about the fonts... the answer is..." (I especially liked that one: http://gnome.themes.org/comments/theme.965/11/)

Anyway, if it doesn''t help. Have a look around; It''s possibly just that specific font package which is not working.

Ciao!