Book trailers are pretty easy to do. This one was done in Windows Movie maker - a free program that comes with Windows. You can buy higher end programs such as Premier or FinalCut Pro, but for these little snippets it's not really necessary.
I'll see how it does in terms of sales... 128 views in 3 days.
Very nice, Peter! Well done! I really liked that you included the maps of the regions in question. Excellent.
I've made a few book trailers, too. They're posted here on this site and also on YouTube. The combined number of views on YouTube is in the thousands now. Clearly, however, those thousands of views have not translated into nearly the same number of sales (not even close!). Still, I think the trailers are worth the effort because at least they give the book a lot of exposure. And it costs virtually nothing for that exposure. Can't beat that. :-)