The main site for Tolkien fans is of course the Tolkien Society, and that has links to many others. The Encyclopedia of Arda explores Tolkien's imaginary world in great detail, with maps, timelines, illustrations, etc. There are numerous sites devoted to the languages of Middle-earth, and even to Elvish heraldry. Another impressive online resource for studying the books is the Lord of the Rings Project. And there are a number of blogs that offer fascinating insights into the thinking and spirituality of this profoundly Christian writer: I recommend particularly The Flame Imperishable by Jonathan McIntosh, and Bruce Charlton's Tolkien's Notion Club Papers. Raymond Edwards has recently written a superb pocket biography of Tolkien for the CTS. Finally, an excellent two-part article on Tolkien's Catholicism by the American writer Drew Bowling can be found here and here. There is a TOLKIEN SPRING SCHOOL on 21-23 March 2013 at the Oxford English Faculty with many excellent speakers.