Hi,
for those, who would like to use several fonts for different CSS classes, here is a solution code:
Cufon.set('fontFamily', 'reenie').replace('.ueberschr1');
Cufon.set('fontFamily', 'tangerine').replace('blockquote');
"reenie" and "tangerine" is the font name.
.ueberschr1 is a CSS class
blockquote is for quotes