idea for RDF newbies

Hi all

It seems to me that newcomers to RDF would greatly benefit from a 
human-annotated site about ontologies, with examples, use cases, reviews and 
maybe popularity score and often-used-with list. 

So, what vocabulary to use behind the site? ...I'll use Tom's hReview vocab 
for the basic reviews, but does anyone know of a good vocabulary for 
attaching use cases and examples ?  I put those things into abra-discuss so 
I'll use that if there's not another standard out there.

Any comment or suggestion welcome about the general idea of doing a 'how and 
when to use' vocabulary site.  

Thanks

--Golda