I think I've been living under a rock for at least a year. I recently learned about creating Book Trailers, a fantastic and creative way to promote your book online.
I've perused a few trailers and they make me want to, at the very least, check the book out. Even if the genre isn't my 'thing'.
Here's a book trailer for Wake by Lisa McMann.
Let's see the trailer for Duma Key by Stephen King.
And Witch Fire by Anya Bast.
As you can see, not much money needs to be spent on creating these trailers. Add a few eye-catching pictures, a dash of tantalizing music and some snappy words (the most important ingredient) and you'll be reeling your readers into checking out your book.