Iif you are trying to get unified fonts and appearance for gnome and kde applications, you should try installing gtk2-engines-gtk-qt. It is available in Debian unstable, just make sure you have Debian unstable repositories in /etc/apt/sources.list, then do:
apt-get install gtk2-engines-gtk-qt
After installing, open the KDE control center and select "Appearance and Themes". You should now see an entry called "GTK Styles and Fonts". Make sure to select "Use another style > Qt" and "Use my KDE fonts in GTK Applications". You can then test it by opening a GTK application like Firefox, Gimp, or Openoffice. The user interface fonts and menus should look similar to those in your KDE applications. The settings should stay upon reboot, so you don't need to go into Kcontrol each time.