As a Kindle 1 owner, I couldn't agree more. If you look at a Kindle funny it changes the page. And as it is I chain the volume accidentally far too often on the iPad. No more side buttons. Arrows on the keyboard would be nice though.
You know, as much as I like the iBooks interface compared to the Kindle interface, now that I am reading a book with the Kindle app, I hate not knowing what page your on, but I have noticed that I do not accidentally change the page like I sometimes did in iBooks.