Embedded.com has an interesting article about the ZigBee standard. ZigBee is increasingly becoming the standard that is gaining acceptance for wireless sensor networks. ZigBee provides a standard spec allowing development of low-cost, low-power wireless sensor nets that work together and can run for more than a year on batteries. The next market driver will be the entry price. The availability of ZigBee chips under $5 in low volumes is acceptable to early adopters, but, as with Wi-Fi and Bluetooth, the real turn will occur when this price is driven down further. Expect significant price reductions (to under $2) as mass markets build.