Web services returning RDF?

I've just discovered the very cool web services described at
http://www.daml.org/2001/10/html/ <http://www.daml.org/2001/10/html/> . Each
returns some RDF based on a parameter passed in a URL. Musicbrainz also has
a web service that returns RDF. 
 
Does anyone know of any other web services that return RDF? 
 
thanks,
 
Bob DuCharme
www.rdfdata.org
www.snee.com/bob