I consider one of the great advantages of the Sony readers I have owned (previously PRS-505, now Daily Edition), is that no matter how many e-books I may have in progress when ever I get around to opening them again I go right to the page I left of, even if days later. Before with paper boos I used book marks, just what ever was handy; the receipt fro grocery shopping, any business card that was handy, a torn off piece of napkin, ...