Although far too simplistic as a definitive description, this chart does seem to assist those asking the question, "What are the ideals espoused by Gnostics and how do they differ from 'traditional' theology?"
[DISCLAIMER: Very difficult to do this sort of thing without resorting to clichés, so bear in mind that most "orthodox" perspectives are extremely well reasoned by some of the greatest thinkers of Western Civilization over millennia and are not to be dismissed out of hand. This is merely a shorthand for pointing out some of the key differences between Gn interpretation and "traditional" interpretation.]
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A Gnostic friend of mine said that one of the biggest misunderstandings of Gnosticism is that it is dualistic.
The best description I've seen so far is MetaHistory.org