ThePudding provides free, PC-based phone calls to anywhere in the US or Canada. The big catch: computers in Fremont, CA will eavesdrop on and analyze every word of your conversation so they can serve up advertisements tailored to the topic at hand.Users initiate a phone call simply by visiting ThePudding’s website (currently in private beta) and entering a phone number into the browser. After the call begins, advertisements tailored to the conversation will begin to appear on screen. The NYT has a good screenshot of what these advertisements will look like here
www.techcrunch.com/2007/09/24/thepudding-targeted-advertising-comes-to-phone-calls/ - 61k