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Nephila clavipes
Found in the tropical rainforest of far north Queensland, Australia.
Hm, I've found a closer match. Someone else spotted a spider very similar to yours in Australia. It's the Golden silk orb-weaver. http://en.wikipedia.org/wiki/Golden_silk...
kunzah, it looks pretty close, I'll name it that and see if anyone else comments... thanks.
Definitely not totally sure of my ID, but the photo I've added as a reference shows a strikingly similar specimen.
Cool spider!