I like to read one book at a time and i get a craving for certain genres from time to time. For example i'm a huge fan of 16th Century historical biographies, horror and fantasy. I've just finished one on Anne Boleyn and now and going to read another Discworld one as i still haven't read them all. But i do tend to want to re-read the same books over and over again. As a youngster i had a terrible habit of scan reading a book first and then re-reading it straight afterwards! Thankfully i no longer do that but it did come in quite handy when trying to find the right passages in the massive books we had to work through for uni!