As a generalized idea, I'd say that the Q&A + voting + commentary format is a more natural user experience for the majority of corporate workers, when compared to the more general "wiki" experience.
That the latter has been successfully pitched/sold into companies (which often have difficulty making good longterm undirected use of same) is a very good sign that a "Quammer" or "Quorkia" type enterprise edition of Quora could do equally well, especially if combined with various types of dashboards/stats to help surface participants well-respected within their department/across the company (which is otherwise generally only possible anecdotally in most SMB-and-smaller level organizations.
deano.com 