I was trying to find dome good tutorial info on RDF today, preferably articles that weren't liberally sprinkled with 'directed graphs' and 'triples' and 'bags'. Here are some of the better ones, although I'm still looking for a good, clear description of why the RSS format uses RDF rather than pure XML. I guess some if it is to do with future possibilities.
Why RDF model is different from the XML model
An Idiot's guide to the Resource Description Framework
Using Web Metadata: The Dublin Core
Using Web Metadata: The Resource Description Framework