I have a few unanswered questions about the true nature of dwarfs.
1. Are they short?
2. Are they the dark counterpart of elves (dark elves)?
3. Is the plural of the word "dwarfs" or "dwarves"?
1. Are they short?
I read that there is no evidence recovered from the Viking Age to suggest that dwarfs were short. Of course, most of our information about the Old Norse myths comes from the Poetic Edda, written by Snorri Sturluson hundreds of years after the Viking Age had supposedly ended, so that could be said about many things from Norse myth.
2. Are they the dark counterpart of elves (dark elves)?
Dwarfs turn to stone when exposed to sunlight. It's a fact, I own a copy of the Poetic Edda. In another game, Hammer of the Gods, a 1994 turn-based-strategy game developed by New World Computing for MS-DOS, states that the dwarfs' home is Svart-alf-heim. "Svart" is the Old Norse word for "black", and "alf" is Old Norse for "elf". I also read that dwarfs and black elves may have been the same creature.
3. Is the plural of the word "dwarfs" or "dwarves"?
In the copy of "The Hobbit" that I own, it says in the preface that the true spelling of the word was "dwarfs" and that "dwarves" was only used to refer to the descendants of Thrain (or somebody, I forget exactly whom). It also said that the reason for this was explained in a later book. I never got around to reading the rest of them.
When I spellcheck this post with the Google Toolbar, every mention of the word "dwarves" is marked as incorrect. When I click on the word for a list of correction, it gives me "dwarfs".
(FYI: Tolkien got the name for every single dwarf in Bilbo's party from the Poetic Edda. Did I mention that I own a copy? Obviously he did too. Show of hands, who else does?)