I ran across another great post on dark patterns by Harry Brignull on A List Apart a few days ago. I first learned about dark patterns back in December 2010, and I was immediately intrigued by the concept of consciously using psychology & UX methodology to mislead the user.
Mr. Brignull not only provides clear illustrations and real-world examples of how dark-patterns like hidden costs, trick questions, and forced continuity are utilized but, more compellingly I think, he explains that despite whether dark patterns are implemented intentionally or via misadventure they are often hard to eliminate. Dark patterns often perform well in A/B and multivariate test because their subterfuge frequently results in more conversions; eliminating the dark patterns usually means at least a temporary decrease in conversions and/or revenue.
It’s a great read, and don’t just take my word for it, head over to A List Apart so you learn more about dark patterns, and possibly find out where you and/or your organization falls on the “honest interface to dark patterns continuum” scale!

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