Easy option: you can create a free 30 second trailer through Animoto http://www.animoto.com. They have templates that look professional and fun and have free music. However, the templates are limited on the free version. I was planning on using this site, but ended up doing all myself instead. That’s because I wanted to add voice and music and Animoto will only let you use one audio track in the free version.
First, I recorded my voice in GarageBand on my Mac. After I did the speaking part, I chose stock clips from GarageBand and edited them to go along with the words. There is a lot of stock music in the program that you can use for free. I exported directly from GarageBand to an .mp4 file to use with the video.
To create the slideshow, I downloaded a free program, PhotoStage. http://download.cnet.com/PhotoStage-Slideshow-Producer-Professional/3000-13455_4-75219736.html
It was easy to use without having to read any instructions. You drag and drop in your images, put them in order, choose how many seconds to display each, then choose your transitions. They have a good selection of transitions and effects, including morphing. Using the zoom effect alongside the transitions made the video have more motion.
I dropped in my audio track first, then adjusted the timing of each slide to match the audio. PhotoStage lets you save and export it directly to youtube (or facebook).
Because I edited the music myself from clips instead of going with a completely stock track, the whole process took me about 5 hours. Making a video is a great way to promote your book. It acts as a synopsis that gives a preview of the illustrations at the same time.
The book video trailer I created for Bubba the Bulldog Tries to Smile can be seen here: