My dictionary is a reticent and uncooperative sprite, answering only questions I think to ask. I'll vouch for the first two. It looks and tastes a bit like chunky BBQ or hoisin sauce. DoubleClick, in fact, decided that its information on users' surfing habits was so meaningless, at least for now, that it does not even offer it to advertisers. I wonder if the real gold mine will be the competitive advantage of providing better service through personalization.
Some sites actually provide a service, rather than just advertising one.
Some of those sites could actually work better if they adapted to the user. To some extent, all sites provide the service of information and could be enhanced somehow . Even simple things could be useful. Last night I discovered Gnocatan , a networked computer version of the board game Settlers of Catan. But that's only a danger on systems that violate the HTTP specification.