The Invisible Library. Has books that exist only inside other books. Neat stuff. Talks of various books by Holmes & Watson (Doyle) as well as Oolon Colluphid (Douglas Adams), though I was disappointed that too little of Lewis Caroll is mentioned.
Invisible Library
I found the Invisible Library, a catalog of books that exist only within other books. It features imaginary titles from authors like Arthur Conan Doyle and Douglas Adams, though it could use more entries from Lewis Carroll.