I don't understand the tech issues involved. But I have used ereaders since the early 1990's. The Rocketbook, the RCA 1100 (I believe it was called), I've had 2 Sony models and Kindle 1 and now Kindle 2, and as much as I love my kindles, kindle books have more format errors than all the others I've read combined over about 16 years. I know it sounds like I'm exaggerating, but I'm not. I only buy books from Amazon from big publishers, Penguin, Bataan, ect. I do not buy anything simply converted from PD, (I edit for PG so I know how to get those myself), and I still come across 20% of the Kindle books I buy that have format issues. By this I mean characters instead of letter, type over type, wordsrunningtogetherlikethisforpagesonend. I bought one book for my Sony, published by Penguin, formated perfect for Sony, bought the same one, same publisher, on Kindle and it had format issues that made it literally unreadable. I don't understand the tech issues, but I do know that if I buy a Kindle book, I check it immediately for format issues, as they don't always show on the sample, and then I can return it if I need to. I don't feel the need on my Sony, I am confident and just buy the book to read later. I've had a couple with odd word spacing on Sony, and some typos, but nothing "really unreadable".