I visited the Bloomfire booth at the ASTD Technology conference - and can't wait to try out their product. Bloomfire is a collaborative learning portal for internal company use. It's not launched yet - but you can get a sneak preview by sending the team a request.
Unlike an LMS where you post structured courses, Bloomfire allows SMEs to post a document, webcast, video etc. to share with others. You can contact the author, ask questions and/or start a discussion thread. There are good back-end metrics to track course activity and performance. Thinking this might be a good way to get a pulse of the popularity of course topics and learning needs.
Check it out: http://www.bloomfire.com/