Tacit Knowledge

Chris Dillow provides an excellent example of tacit knowledge:

I've just bought my stepsister a birthday card. I write it, and then realize - I haven't the foggiest idea of her address. But I know where she lives. I've been there dozens of times, and could easily drive there without a map.

See EconJournal Watch 2(1) 2005 for a symposium on information and knowledge, and I'll reiterate that if you accept a distinction between the two (Owen...) then you have to relinquish strict neoclassical economics.