Actually, it's Dill that's supposed to be Truman Capote.
In any case, incredible book, although it was a little disappointing in that it failed to live up to its title. I never did learn how to kill a mockingbird in that book.
The title derives from this line in the story (paraphrasing from memory here): "Kill all the bluejays you want, but remember it's a sin to kill a mockingbird."
Edit: On second reading, you were probably joking. Oh well.