Few months back I read an article in ReadwriteWeb about todays RDF based Semantic web applications. Where I found some commercial RDF based semantic web applications like Twine, Talis, Garlik and there are some others which use RDF.
But we still need to see more of, the said commercial RDF based semantic web applications. The best markets listed for RDF applications are health care, consumer, enterprises and other such markets.
Many people considering the few applications present still believe that we are in the Generation Zero of the semantic web. Here I would also like to point out one of my favorite Semantic Database which is again an RDF based model from Brainwave Platform