That's a really good idea. I just sort of keep mine stacked in the order that I've read them in, but it doesn't really help. I should start doing that.
Favorite book: at this point in time it might be An Abundance of Katherines by John Green.
I like Luna, I feel like she's the understated friend. Sort of like, she's a part of gryffindor, but she's got the weird mysterious aura around her so she doesn't talk to many people. If not her then I'd be Her-my-knee.