I have linked you directly to the page where there is a list of newly released movies that are "Now Showing" in theaters.
It's much like going into a theater; the terminology, choice of graphics, and overall web design. When you go in, note the last digit of the number that follows the name of the Trailer you want to watch. It'll be either L for left or R for right. Then, click any movie title. Inside, go into the Left
Screening Room. Next, Call the Projectionist
and click on the trailer. It's simple, and it's very fun to watch these. Much better than reading the reviews. These are long, 10-20MB's each. Enjoy.