I don't like rereading books. The way I see it, there are more books in the world that I want to read than I will ever have the time to do in my lifetime, so why waste time reading the same one twice. If I do happen to read a book a second time, it is because it is years and years after I last read it and suddenly find myself remembering how much I enjoyed it.
I read American Gods by Neil Gaiman back in January on my Kindle; I was in a used bookstore the other day and found a really cheap trade paper back copy... and now I already find myself feeling nostalgic for the book and getting an urge to reread it. Never read a book twice in the same year before, maybe this will be the first.