Morten Frederiksen suggested a change to the FOAF snippet in my RSS:
A small suggestion for using foaf inside something like dc:creator: State the above line as<foaf:mbox_sha1sum rdf:value="69e31bbcf58d432950127593e292a55975bc55fd"/>
instead, that way the XSLT/XPath string value of dc:creator is just the name of the person. This can be useful when parsed in a non-RDF context.
A good idea, which I've now implemented.