What references offer a good summary/tutorial for using RDF/OWL? There seem to be enough tools (Protege, Topbraid, Jena, etc.) that knowing the syntax of the markup languages is not necessary, but knowing the concepts is, of course, still critical.
I'm working through the w3c documents (particularly the RDF Primer) but I'd like to find other resources/techniques to use as well.
A very good introduction to the semantic web in comparison to object-oriented languages is this document from W3C: A Semantic Web Primer for Object-Oriented Software Developers. It helped me clarify a lot of things from the beginning.