Advertisers will pay more when they know more about the audience, says Patrick Keane, an analyst with Jupiter Communications.

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"Amazon.com has executed particularly well on an opportunity, " says Nicole Vanderbilt, director of digital commerce with Jupiter Communications in New York.

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"The key to the castle in luxury goods is access to the best supplier brands, " agrees Michael May, senior analyst at Jupiter Communications.

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"The key to the castle in luxury goods is access to the best supplier brands, " agrees Michael May, a senior analyst at Jupiter Communications.

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"I'm not convinced that the prospect for universal messaging on one mailbox can handle all your needs, " says Seamus McAteer, senior analyst at Jupiter Communications (JPTR).

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Research firm Jupiter Communications reports that 55% of Internet users say they mail e-greetings regularly, handily beating those who say they chat on-line (45%) or read classified ads (46%).

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ISPs are cagey about how much they get, but Noah Yasskin of Jupiter Communications, a telecoms consultancy, estimates that Freeserve's share of the connection charges broadly covers its costs.

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The new rules shouldn't cause chaos in the online kids' market because most major children's sites already work to protect privacy, said an analyst at Jupiter Communications LLC in New York.

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Some 49 million people in the U.S. now have access to the Internet, and the number will double by the start of the new millennium, according to New York-based market research firm Jupiter Communications.

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