Do you have bookshelves? What kind do you prefer, large tall ones or more easily managed small ones? Wide or skinny? What do you keep on them, other than books?
I like medium sized ones mostly. I have one that's tall, with a lot of space between the shelves, but it doesn't really have enough shelves. All of my medium sized ones are actually homemade and more sturdy than the store bought one.
I keep CDs, DVDs, games, VHS tapes, and figurines on them. Plus lots of miscellaneous stuff on that I don't really have any other place for, too.