
Read this: TV's Next Wave: Tuning In to You - WSJ.com

Summary: We discuss how cable and satellite co's are mining this data, how they're using it to stay ahead in the age of the Internet - and how you can opt out of being tracked. Data-gathering firms and technology companies are aggressively matching people's TV-viewing behavior with other personal datain some cases, prescription-drug records obtained from insurersand using it to help advertisers buy ads targeted to shows watched by certain kinds of people. At the same time, cable and satellite companies are testing and deploying new systems designed to show households highly targeted ads. - online.wsj.com
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