These are my fav links for Tolkien’s tongues:
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Ardalambion:
Fauskenger’s website. The best place to learn of Tolkien’s languages (common opinion), with grammars, studies and examples, and cool wordlists. It has been translated into a lot of tongues by his fans.
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Hiswelóke: How to tell you, the best place to learn sindarin, it even has a downlable dictionary. Also an on-line dictionary and lexicon.
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Mellonath Daeron:
The language section of the Forodrim. They are the pioneers and have been working since 1972.
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E.L.F.:
They are the language section of the Mythopoeic Society. Their journals are the most renown for those focused to learn of Tolkien’s tongues, they are related to the Tolkien Society too and have the blessings of Christopher Tolkien, enough to say. They are trying to translate The Silmarillion into sindarin and quenya :P
Nolen