There's more on the use of the Golden Ratio at Pendery.org (in Lightroom) and in Layers magazine. Layers has another tutorial, a video that shows you how to construct of the Golden Ratio and spiral; see Illustrator: Golden Section.
For tips on creating your own spirals, see the AEP post Taming the Spiral. [update: see Ellipse Tool Plus from Hypoly too]
It's a wild world, so there's no reason to get stuck on one schema. There's whole other orders of pattern available in Penrose tilings and Islamic patterns. But some roads can be too ethereal for suit everyone, like Christopher Alexander's ideas on design, complexity and order, or film editor Walter Murch's observations on the similarities of between the Pantheon, the ratio of planetary orbits, and musical scales.