When I re-read, I usually use one of our extremely-beat-up paperback sets (we have two or three), because my big one is...well, really big, and leather, and collectible, and prized, and things. But when my dad reads it aloud, he uses his really big, leather, collectible, and prized copy, and has ever since we were little.
<edit> I mean, of course, when I re-read LOTR.
Right now I'm reading Emma by Jane Austen in bed (it's great fun, and while I like Emma, I'm ready for her to mature. I love Mr. Knightly. He's so going to be haremed when I finish). I'm reading The Well of Lost Plots by Jasper Fforde out of my bag, and it's also great fun- FoolofaTook, have you heard of Jasper Fforde? I think you might enjoy The Eyre Affair, his first book, very much.