At the very least, it "saves" your game between sessions, so you can continue where you left off. I wonder if anyone has made a book to be read this way so you can easily know where you stopped reading?
All the games on the Kindle console support this feature.
Hmm, this could be kinda nice, especially if you want to ctrl+f search for a previous passage, without the risk of jumping ahead and spoiling yourself. I wonder if any ebook readers (software or devices) have implemented that specific feature.