Not that simple. In fact:
find /usr/share/fonts -name tahoma\*
/usr/share/fonts/webcore/tahomabd.ttf
/usr/share/fonts/webcore/tahoma.ttf
/usr/share/fonts/msttcorefonts/tahomabd.ttf
/usr/share/fonts/msttcorefonts/tahoma.ttf
Emacs can't find courier and helvetica, which are of course also there. So it's something else. One thing that I found strange, was that under /usr/shar/fonts there is no ISO8859-1 directory, altough there is a ISO8859-2 (which is the encoding used for Hungarian.