It sounds like you're on the right track. CouchDB supports master-master replication that is very easy to configure. So you could put your fonts into Couch and have other font users replicate your fonts onto their own Couch servers. This would let them access your fonts as often as they want without having to head over to your server each time they want to pull a font (their CouchDB would copy all the fonts once and then the clients would pull from that Couch node instead of yours).
The added benefit of Couch is that if a user on another Couch node adds a font, the master-master system will replicate it to your node so you can see it locally. This is a pretty handy feature that many folks fail to recognize about Couch.
See more here: http://guide.couchdb.org/draft/replication.html