I call book trailers "bookmercials" for my students. They are extremely useful to generate interest in books, genres, authors, etc. Check out these resources to find bookmercials:
http://www.booktrailersforreaders.com/
http://booktrailersforall.com/
http://www.homepages.dsu.edu/mgeary/booktrailers/
or http://youtube.com/ and type in a title of a book or "interview with [author's name]"
Want to know more about "bookmercials"? Check out this website for information:
http://www.darcypattison.com/marketing/book-trailers/
