The lookup movie info in Wikipedia is a great feature, one I really use and saves me time.
Could it be possible for you to include different sources like Amazon and IMDB. Wikipedia sometimes has a screen capture instead of a poster or cover, like Casablanca or lacks any picture like Ace Ventura When Nature Calls. Also in cases like Animal Farm there is no reference to the movie, but instead to the novel by George Orwell or in the case documentaries no information is available.
In most cases Wikipedia has more information on mainstream movies, imdb has a larger movie, documentaries and series database. But making it possible to use several sources could be beneficial.
I'm always looking for media manager applications and yours is by far the one I use the most since MC11. For example I use mediamonkey to tag and organize music (5 amazon.com databases) which is helpful because some info is not available in all servers. Boxee uses IMDB and a nice feature is it recognizes series down to the individual episode, not just the season as with Wikipedia.
I hope you can develop this feature more, id be willing to help extensively with you to develop it and provide feedback.