I don't know how they do it, but they seem to get the latest trailers and tv spots the quickest.
A great site to check out the latest movie trailers. Also the place to go to download the latest quicktime player to view trailers and listen to audio.
Another great place to view trailers online. You not only find the latest trailers at this site, but also a bunch of older trailers.
Box Office Mojo is the Internet's #1 box office reporting service. It's a handy site to check out daily and weekend box office results.
The Internet Movie Database. Info on upcoming films, directors, actors and all things movie.
Don't be fooled by the name. Rotten Tomatoes offers a full range of services, features, and community for movie fans.
The Internet Movie Poster Awards is a great site to find pictures of the latest movie posters. They usually get them as soon as they are available
A good site for news and trailers, but they have a pretty good collection of tv spots as well.