How to mix SKOS and OWL? And Protege bug

We're just getting our feet wet in the Semantic Web and we want to develop an ontology that has both OWL and SKOS facets.  But are there any examples out there on how to mix the two in the same ontology?

And I'm having a devil of a time getting the latest version of skos-core.rdf to even import into Protege.  Here's what I encounter; is this Protege's problem or yours?  What ontology editors do you use?  If I can't bring SKOS into my ontology editor I can't use it ...

Thanks!  Enjoy!

John M. Linebarger, PhD
Sandia National Laboratories
Albuquerque, New Mexico, USA

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[ProtegeOWLParser] Warning: No default namespace found in file.  Will use http:
/www.w3.org/2004/02/skos/core
[ProtegeOWLParser] Completed triple loading after 391 ms
[ProtegeOWLParser] Warning: Trying to add import for external resource: http://
mlns.com/foaf/0.1/
[ProtegeOWLParser] Importing http://xmlns.com/foaf/0.1/ (from http://xmlns.com/
oaf/0.1/ [actual ontology at this location: null])
[ProtegeOWLParser] Warning: Trying to add import for external resource: http://
url.org/dc/elements/1.1/
[ProtegeOWLParser] Importing http://purl.org/dc/elements/1.1/ (from Redirect to
http://protege.stanford.edu/plugins/owl/dc/protege-dc.owl)
[ProtegeOWLParser] Warning: Ignoring namespace prefix "dcterms" for existing pr
fix "dct"
[TripleChangePostProcessor] Completed lists after 0 ms
[TripleChangePostProcessor] Completed anonymous classes after 0 ms
[TripleChangePostProcessor] Completed deprecated classes after 0 ms
[TripleChangePostProcessor] Completed properties after 63 ms
[TripleChangePostProcessor] Completed named classes after 0 ms
... Loading completed after 2516 ms
WARNING: java.lang.ClassCastException: edu.stanford.smi.protegex.owl.model.impl
DefaultRDFProperty
        at edu.stanford.smi.protegex.owl.ui.properties.OWLObjectPropertySubprop
rtyRoot.getTopLevelObjectProperties(Unknown Source)
        at edu.stanford.smi.protegex.owl.ui.properties.OWLObjectPropertySubprop
rtyRoot.<init>(Unknown Source)
        at edu.stanford.smi.protegex.owl.ui.properties.OWLObjectPropertySubprop
rtyPane.createRoot(Unknown Source)
        at edu.stanford.smi.protegex.owl.ui.properties.OWLSubpropertyPane.<init
(Unknown Source)