When I first got my iPad, one of the first apps I downloaded was the kindle reader. Many Amazon e-books are free, more than you could read. Amazon has set up a 'most downloaded' list for the free books, if you get tired of browsing a sea of mediocre free uploads. It doesn't help as much as you would think, most of the books in the top 100 aren't something I would read.
Why buy a book when you can get it in the library for free? And paper books have many advantages. They aren't so expensive when you lose them or they get stolen. You don't have to recharge the batteries. And because paper books in bookstores and libraries are mostly by major publishers with many people involved, most of the absolute dross gets filtered out.
So tomorrow I'll explain some of the reasons I'm using my kindle app more and more.