Go to the front page of an ebook store today and you will see on the front page what many people have been waiting for. Harry Potter is now available as an ebook. It took a long time, but on the front page of Amazon is Harry Potter for the Kindle, on the front page of Barnes and Noble is Harry Potter for the Nook, and it is even on the front page of the Sony ereader store, although they technically had access to it previously if you bought a special version of their ereader.
Up until now, JK Rowling had not let the book into the ebook reading world. She once said she though books should be enjoyed as books, but I guess she has had a change of heart. It seems like it was an inevitability that it would get there eventually.
It does seem notably absent from the Kobo bookstore though.