AdTunes.com
I stumbled across this website after finding the link at Billboard.com.
It apparently started out as a forum for identifying music used in commercials (we ALL know how frustrating that is!), but now has grown to include music used in movies, TV shows, video games and movie trailers. It's NOT a listing, but a forum (like HTF), so everyone helps identify songs and you need to use the search function pretty well to get results. To see how fanatic some of these members are, do a search on "Target" and read the thread regarding the music used in the Virgin Pulse MP3 player commercial last year (the one with the palace guards dancing)...someone actually tracked down the AD AGENCY that produced the commercial for Target to get the full story!
With the number of songs that end up here to be ID'd, I thought this would be a site to bookmark for many of us!