It is still unclear how much the system will cost, although Microsoft says Natal add-ons will work with its existing Xbox 360 gaming console.

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The two higher-priced models feature nice add-ons like a USB port and Fiat's hands-free communications and entertainment system.

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In the housing market, Hovnanian Enterprises has created an IT-based system that makes it easier for home buyers to select new options and add-ons they would not otherwise have known about.

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