If you followed the news about the iPad, then you know about the iBooks app and store. You may also know that by supporting the EPUB format for books, Apple has given all iBooks users access to not only the tens of thousands of commercial ebooks sold with Fairplay DRM, but also to any DRM-free ebook in the EPUB format. We have already heard about the 30,000+ Gutenberg books that will be included within the iBookstore. What I haven't seen mentioned all that much is the over a million public domain books Google has available in EPUB (link). This was the last significant argument the Sony Reader devices had against the Kindle, so why shouldn't Apple harp on it a bit more. All the better for Apple, of course, since it has the added benefit of the Kindle app (and probably the Barnes & Noble Reader app later on) and a handful of really great looking comic book readers/stores.