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I didn't gain anything new or read anything that isn't simply common sense, from this article, although I know strange and unexpected things do occur in interviews. Answering a cell phone? That would definitely put someone OFF!
As far as thank you/follow up notes, I received one once, and didn't quite know what to make of it. It seems almost like "sucking up" to me. Being polite is very important, however I don't see a thank you note as necessary or helpful. Of course the person took the time to interview you, they're trying to fill the position! Anyone else - are you influenced by thank you notes?