The first ebook I bought for my new Sony 600 was Hitchhiker's Guide to the Galaxy. It had many typos. The most annoying was that every word that had a "ff" in it, the first f was replaced with a space. E fective, e fort, e ficient throughout the whole book. Great story, lousy ebook.
On the other side, I want to praise George R R Martin's Song of Ice and Fire ebooks. They had almost no errors.