So I am just not starting to get into the idea of ebook readers. I am in the process of downloading ereader, B&N ereader, stanza, and kindle. Are there any others I should be checking out?? I was wondering any opinions on the various apps in regards to ease of use, features, ease to read, and book availability. Also, what are the differences in format? Like could I download a book and read it in any of them? What are the different restrictions between the different apps? Like, correct me if I'm wrong but if I download a book from amazon it can only be used in kindle right? Also, which app allows you with the cheapest (or free) book downloads? Thanks for any advice!