This is just the tip of the iceberg for Nintendo TVii, which will be a free service when it launches in the United States and Canada.

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The company says it hasn't yet turned a profit, CEO Eric Liu said, but he hopes police departments that currently get its service for free will later sign up for paid premium services and upgrades, such as a secured anonymous tip service through the Web.

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If you take a taxi, tip the driver 15-20% of the bill, plus a few extra dollars for extra service such as helping you with a heavy bag.

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