> Has Amazon ever talked about how many books they have sold? I wonder how many they sold the first month of the Kindle being on sale? I don't think that is necessarily a number to make Amazon feel safe.

Even if we had that number, I'm not sure it would tell us much because the two devices are very different. On the Kindle, buying books is the primary thing to do. On the iPad, it is just one of many.

So while many iPad might be sold to people who will never read e-books, these people probably aren't reading on Kindle or even on paper anyway.

The Kindly simply isn't bought by these non-readers, so the average number of books sold per device means something different.