IDEO’s David Kelly (or is it his?) has some great examples in his TED appearance. Entertaining? A talk about human centered design should be anything but dry.
Human-machine communication and interaction that is intuitive means experiencing the machines and information the same way we use our hands and our senses – a lower learning curve results since the same skills you used in real life apply to the interface and to control. It sees only recently that processing power can do this. We even see this in Flash with with rhe port of openCV with FLAR toolkit.
It can be more than that, though. Cleverness and good designgo hand in hand, and applying common sense usability can pay dividends – in fact it seems the common sense is what defines usability.