The Book Seer is a site that recommends books that you might enjoy based on the last book you read. Here are some of the results for To Kill a Mockingbird.
* The Catcher in the Rye by J. D. Salinger
* Lord of the Flies by William Golding
* Catch-22 by Joseph Heller
* 1984 Nineteen Eighty-Four by George Orwell
* Of Mice and Men (Penguin Red Classics) by John Steinbeck
* The Great Gatsby (Penguin Popular Classics) by F Scott Fitzgerald