Create your own video slideshow at animoto.com.
I threw this animation together using some of my flannel board images from Flickr. It's not really a trailer because it shows components of the entire story (although lots of movie trailers do that, which is why I don't often watch them!), and it's not featuring a book but a folktale for flannelboard. But it was so easy to make and share this, that I suspect I will return to the site and see what else I can do with the simple tools there. (I also love how the song nearly matches the story, especially because I picked it at random without listening to it first!)
A lot of folks at our library, especially children, are totally captivated by Internet video. Sometimes it seems they don't even care what they are watching. So if I could find a way to connect them with some "trailers" from the library, perhaps we could actually advertise storytimes, new books, and other events. A few simple "trailers" like this on our library home page might catch an eye or two, informing current patrons about services they might not have known existed. More exciting "trailers" posted online in the right places or by the right people might actually draw new folks to the library.
I also wanted to share a real book trailer that my mom (a 1st grade teacher) sent me. Warning, total cuteness overload, but also made me want to buy the book for our library and gave me some ideas about how to use it.