As this article from Red Herring points out, we are only at the beginning of media search. Given the number of companies working on this, and the massive amount of new content being created on global scale, this field will see some significant advancement in the next decade. "Minority Report," here we come.
"Even multimedia search is still very much in its infancy. As it is, search technology has yet to perfect a way to find still pictures across the Internet. Right now, Google, Yahoo, and MSN mine the web for text aiming to find pictures related to it tagged with the same search term—and results are often feeble."