"How many books are available for the iPad? I'm trying to decide whether I should buy an iPad, a Kindle, or a Nook?"
While there are many other factors that go into choosing an ebook reader than just how many books are available, I'll start with that as a metric since that's the question. There are two primary ways you can easily get books for an iPad. You can download the free iBooks app from the App Store, or you can download the free Kindle app from the App Store. Both have a huge number of books, although the Kindle store currently has more.

