It's not clear what can be searched on this. The interface suggests "concepts", and I'm not sure how I would define those in a movie trailer.

Being able to search actors or movies would be interesting, but IMdB already serves this purpose. Searching dialogue is what I was hoping for, similar to morbotron.com or frinkiac.com. filmot.com does this for general YouTube videos, but I would love to see that applied to a quality film collection.