Booktrack is an interesting service that I recently tried after reading about it on Larry Ferlazzo's blog. Booktrack allows you to add a soundtrack to a text. The soundtrack can be soft music or ambient noises like waves crashing. Booktrack claims that the soundtracks create a better reading environment which leads to improved reading comprehension.
Booktrack offers books that you can read in your web browser and through their iPad and Android apps. Students and teachers can create and share their own booktracks through Booktrack Classroom. Registration is required in order to use all of features offered by Booktrack Classroom. Click here to take a look at some sample Booktracks.