LISNews: Librarian Blog Since 1999

We have a very detailed librarian assigned to local history and who has done an enormous amount of research for patrons on subjects of genealogy and local history. It seems like a good basis of material for a local history wiki. The question is whether to use a well-trafficked site like Wikipedia and risk the perils of mass-editing or to setup something closed off like PBwiki but would be mainly be gotten to through our own website. It could be linked to from Wikipedia, but I'm not sure if a user's interest would extend to the outside links, as opposed to the plus of it being 'right there'.