Ivan Herman of the W3C has a very nice Tutorial on Semantic Web Technologies available in SVG and also POH (plain old HTML). The tutorial includes two nice interactive graphics that summarize the basic RDF and OWL features. Note: viewing SVG in your browser will probably require the latest beta version of Adobe’s SVG plugin (ASV6). To get this to work in Firefox, I also had to follow these instructions.
Check out the other great W3C officesâ€™ overview presentations on a wide range of the W3C related topics. Ivan also inlcudes a link to a page on slidemaker.py, the program he uses to generate these slide presentations.