I've been looking for a good djvu reader. This one looks nice and has a 30 day trial period. Thanks for the recommendation.If you have lot's of technical books (like in Mathematics), and if some of them are in DjVu format then the best ebook reader which reads DjVu files (along with everything else) is KyBook. However, if you don't have any DjVu's then there are other reader apps. But for me KyBook does the job for everything.