I'm wondering if anyone has done any research into identifying which articles in Wikipedia have associated video?

There is this category, which only has 280 or so articles:

It seems far from complete. Appreciate any advice or previous work in this area.

The background: I'm working with some grad students on staging a Wiki Makes Video contest in April, and we'd like to do some measurement of the current state of video in Wikipedia.

Thanks, and email me if you'd like to know more about the video project for April.

-Andrew