Or eBook reader? Since my experience only extends to Kindles, I have no idea how the others work.
After 50 or so books, Kindle organization has gotten a little unwieldy for me.
I currently have about 400 books and have things organized by genre. But I want to reorganize and see if anyone has any good ideas.
What I'd REALLY like is for Amazon to let me do their next Kindle software design. =D