A really good book to look at/think about getting is Karen Wynn Fonstad's The Atlas of Middle-earth, from which a few of these maps are taken.
I guess I could ask a question here to generate discussion (aside from the obvious: if you find more Middle-earth maps, will you post them here?): how cool is it that Tolkien's world has generated as many maps (probably) as if it was a real place? I for one know way more about Middle-earth geography than I do about real-world geography. I mean, that's huge! In The Hobbit, a map is a central plot device in the actual narrative. And I am willing to bet Tolkien started the trend of including maps to fictional places in his books. Who else did that (I mean before; it's almost standard in fantasy now)?