the place where I'm now (http://cascaad.com) does use the freebase dumps as a primary source for out entity database (though more are in the works). It is pretty usable even if some interesting data is not available. The dev list and irc channel is also a very useful source.

We hope to be able to provide rdf/rdfa links at some point, because, hey, the semantic web is a darn cool thing :)