http://www.scholastic.com/teachers/collection/book-videos-author-interviews-author-read-alouds-book-trailers-booktalks has many! Below is a link to one example - Scholastic's YouTube book trailer for The Strange Case of Origami Yoda by Tom Angleberger (click on his name to view his amazing website). My daughter just bought this book and its sequel, Darth Paper Strikes Back, for her middle school classroom library. She'll make some kiddos happy, for sure, and have them ready for the third book in the series, The Secret of the Fortune Wookie, due out August 7!
In my search for resources, I also found a post all about book trailers at one of Keith Schoch's blogs, Teach with Picture Books. Happy trailer hunting!
Here's my preview: My copies of The Daily 5 and The CAFE Book by "The Sisters", Gail Boushey and Joan Moser, are on their way to me at this moment. Both were highly recommended by Dr. Lori Digisi, a literacy specialist and presenter at my first statewide TAS meeting last week. The books provide a structure for increasing student ownership in their reading and a means for improved differentiated instruction. I'll post a review after I've read them.