OK. Since you asked, I created a more detailed guide to RDF. It has two parts. The first page describes the model including triples, types and so on, in enough detail to understand RDF, without barely a mention of syntax. The second page describes the RDF-XML syntax, using examples and terms from the previous section.
The goal is so that people can understand the purpose of RDF without getting distracted with XML syntax. So, if you are reading it, make sure to read the first page first, or you'll be confused.
I include it as part of the Mozilla SDK Guide, although it isn't particularly specific to Mozilla.