jryan,
Again, I am at the conference so I don't have the time to give you a proper response. The second one, which is more memory efficient, only requires as many nodes on the stack as the max depth of the tree. It does this by creating an iterator (one item) for the stack instead of a list of nodes (many) to visit. You then work through that iterator before moving on. This is a poor explanation - I know, but I won't be available to explain in detail until Thursday.
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