The book edited by Tolkien's son - Christopher, dedicated mostly for Tolkien's fans, who, after reading 'The Lord of the Rings', 'Hobbit' and 'Silmarillion', still want to dive into the world of Tolkien's Middle-earth...
The Tolkien Society
The site has information about JRR Tolkien and the books he wrote, his life, books others have written about him, and many other items http://www.tolkiensociety.com/