Well as you see in the title, I am wondering what creature exactly he is. It probaly is stated in the book about him, yet unfortunably, I havn't red that. (it's on my list for books to read in the future though

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I've had some discussion about this with a friend, we cam to the conclusion that he is most likely a Maiar. This might seem very ridicoules to you, but keep in mind that the only information we 2 red about him is Lotr

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But he must be something mightier even then the average Maiar, and much mightier then any elf. For the ring did not effect him even though Galadriel (greatest of all elfs as is said in Unfinished Tales) knows of herself that she isn't great enough to control it, Curunir it drove mad, and even Orolin with the greatest spirit of the istari wasn't great enough for it, yet Bombadil is not at all effected by it....
So does somewone have any other theorys (if it isn't mentioned in a book I havn;t red..) of what Tom Bombadil is?