Has anyone found a way to organize your books on the Fire HD? I share an account with my mom and between us we have over 400 books on the cloud. We mostly share the account so I can buy and download books for her, and we share books only occasionally. I keep forgetting about books I've purchased and mean to read. Also samples I intend to purchase later. Is there any way to create folders like you can on the Kindle readers? Anything short of keeping a written list somewhere? Thanks as always for your help and the collected wisdom of this group!