Are there any true good, reusable abstract ontologies?

Hello:

I've been using protege for modeling OWL-based ontologies for several months.  I like using upper
ontologies as much as possible (reuse, scalability).  However, upper ontologies soon grow too big (SUMO,
etc...).  I was looking for a shallow, simple ontologies for 'person' and 'organization'.  Anyone know of
any lightweight ontologies out there like these?  If not, I'm thinking about creating my own for public consumption.

FOAF is lightweight but doesn't have much in the way for corporations.  Plus it uses older RDF syntax.  I'd
like to go pure OWL - limit it to OWL DL potentially for inferencing (excludes vCard, too).

TIA,
-Matt
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