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For decades, the way the TV networks and advertisers worked together was simple. A lot of people watched TV, the Nielsen company estimated just how many, and the advertisers paid for airtime based on the Nielsen ratings. Now, the TV industry is changing and Nielsen is trying to keep up.">@import "/templates/css/mainstyles.css";@import "/templates/css/bucket_alt.css";@import "/templates/css/stories.css";@import "/templates/css/print_stories.css"; metatext/html; charset=iso-8859-1

...less than a month before the Feb. 17 deadline, so many American households have yet to take the necessary steps to continue to watch over-the-air television - more than 6.5 million, according to Nielsen Media Research - that Congress has considered giving them more time.

According to the latest data, the U.S. "adoption rate" for mobile phones stands at 85 percent. That's higher than the percentage of Americans who have DVD players (84 percent), home PCs (80 percent), digital cameras (69 percent) or MP3 players (40 percent), according to the Nielsen Co. "The concept that within my lifetime we'd have the kind of penetration we have today is unimaginable," says Martin Cooper, 79, the former Motorola researcher who invented the portable cell phone in 1973.