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Araneus
Very cool! Yes, Orb weaver. Not totally sure of the ID provided, but check the reference out.
This beauty is an Orbweaver, Family Araneidae:
http://bugguide.net/node/view/1972/bgpag...
This is an orb weaver; Family Araneidae; most likely a female from the roundness and size of the body. Here is a buggude link: http://bugguide.net/node/view/1972