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Dunno if has been passed around before, but I found this link on Scientific American. thought i'd pass it along:
You also can't go wrong with Google Mars ( http://www.google.com/mars/ ) for maps/imagery.
For some good Earth/Mars comparative info, I like the Martian Time website ( http://pweb.jps.net/~tgangale/mars/facts/factsi.htm ) It hasn't been updated in a while, but what's there is pretty good.