I admit to hoarding children's books but adult books... nope. They come in, they are read and they leave. I don't reread books. I haven't been one to really buy books for me to read (and DH doesn't read books, he's a magazine or internet reading type of guy). When I do 'buy' them its only because I got them at the thrift store. I read them and donate them right back. Mostly though, I've used the library my whole adult life. I hate having books laying around. I have too much clutter without adding book clutter to it. I'm loving the kindle because I don't have to worry about a stack of books taking up residence on my nightstand.
However, I hate that books I've read are still in the same archive with books I haven't read. I need to go through and make a special category for books I've read, I guess... or delete them. I really hate going through my list of archived books and finding ones I've already read because I know I won't read them again, they're just wasting space.