A site bigger than this one, about everything you can imagine about Elves, Ringred has it.
A great discussion forum about The Lord of the Rings, I am known as Denethor II there.
A geat site (the greatest site in my opinion) about the Languages of Middle-Earth. By Helge K. Fauskanger.
A very good site about Tolkien's languages and scripts, with transcriptions and compositions with Tolkien's scripts and languages.