Here's a good example of a book trailer video (and some tips for yours)

How do you make a good book trailer video?

1. Reveal the intriguing central idea or question of the book;
2. Don’t give away so much that people feel they don’t need to read the book;
3. Don’t show actors playing the characters—let the reader imagine them;
4. Don’t try for effects beyond your budget—people will automatically compare it to TV and film productions, and unless you’re being ironic it will come off as amateurish;
5. Don’t feel like you have to explain why you wrote the book. Generally nobody cares, unless it’s a really compelling and relevant story.

It’s easy to find lots of bad book trailers, not so easy to find a good one. I think the one below does a good job. It gives you the basic concept right away, it uses graphics that evoke the era and don’t take anything away from your imagination, and it moves fast and doesn’t wear out its welcome.

It may look expensive, but it’s not nearly as difficult to produce as it looks—there are After Effects templates that could do most of the work. It wouldn’t cost all that much to have it done for you by a freelancer you could find on elance (www.elance.com), for instance. The same effect could even be approximated with a free program called Prezi (see Prezi.com). See what you think:

(For more help with marketing your book, get a copy of my book, "Your Writing Coach," published by Nicholas Brealey and available from Amazon and other book sellers.)