Is there anywhere an easily-accessible description of what substantive changes Tolkien made to the text of Lord of the Rings between the first and second editions?
Also, if you wanted to recommend any works of criticism regarding LotR (other than what's on this list and Shippey's Road to Middle-earth), now would be a fine time. (LotR: A Reader's Companion, by Hammond and Scull, looked good in theory but reading the sample online at Amazon, err, not so much.)