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http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en535967
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http://chezphil.org/slugbee
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http://www.libelium.com/squidbee/index.php?title=Main_Page
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http://www.ic-board.de/index.php?cat=c3_Radio-modules.html
Free Zigbee like protocol
http://www.one-net.info/history_sub.html
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http://www.engadget.com/entry/1234000963023623