Clustering & Semantic Web

Hallo,
I am a student at University of Salerno (Italy). I'm studing Semantic Web
in particular my topic is about the clustering of Web resources through
their RDF standard annotation in order to describe web information. My problems
are related to find meaning  repository of RDF/S pages. I hope that it exists
because it is very important to test my topic's solutions.
If you want know more details I am happy to provide it.
Answer me soon, thanks a lot. 
Giuseppe Fenza