There's an interesting discussion going on over at The Kill Zone. It's about ebooks and book books. The most interesting part of it all is going on in the comments. All of the folks who post there are published writers and they are sharing how much their ebook sales have grown. Check it out.
The rise of ereaders and ebooks is incredibly fascinating to me. With the iPad being launched I think you are going to see a huge rise in ebook sales with in the next few years. I'd even predict and almost 50-50 split when it comes to sales. Half of all book sales will be ebooks. That's how fast this thing is changing. I have no data to back that up, but as iPad competitors come out you'll see the numbers just continue to rise. I think there are a huge number of people out there who contemplated buying an ereader of some sort -- Kindle, Nook, etc ... -- but decided against one since they didn't serve any other purpose. But with these tablet computers coming out that's changed/changing.
Anyway, go check out he discussion at The Kill Zone. Interesting stuff.