Originally Posted by bobsi18
Thanks for that Polly. Do you find the menu system easy to use, and are you able to sort books by series etc?
The menu system is very easy to use. I handed my reader to my computer phobic, refuses to use email, 83 year old, mother and she immediately dove into my book list and opened a book. Ten seconds to show her how to turn pages and get back to the home screen and she was all set. I didn't get my reader back until she'd bought one for herself.
You can organize books into Collections. Calibre does it for me. The reader uses a flat metadata sort of a system. The good news is that the same book can appear in several different Collections, depending on how it's tagged in Calibre, without having to be on the reader in several different places. The bad news is that you can't do multiple tagging. If you're looking for an unread spy novel, for instance, you can't do a search for both unread and spy. You have to look in your spy collection. The reader will put "new" on the cover art of new books so that they stand out better.
None of the major players support folders. If you want that as a feature, you have to look at the smaller ones (Kobo, Astak, PocketBook, etc.).
You wondered about external storage. With the large storage capacities of readers these days, you can carry a huge number of books. There are some circumstances where it a card can help with organization. I have my Star Trek collection on an SD card. I don't want those books cluttering up my reader, so when I want to read a Star Trek book, I can pop in my card. With my Astak, I put my unread books on the SD card. Since it uses a file system, I would navigate to the card if I wanted a book I hadn't read before. It can also be a convenient way to move books to the reader if I don't want to plug it in for some reason. Not the same as WiFi or 3G, but sometimes handy if the cable's not convenient.