NXP [1] plans to support light switches than can be controlled
using 802.15.4 and the 6Lowpan protocol.

Jumping ahead a year or so, your Ben Nanonote with Werner's
atben add-on couls control (among other end points) light switches
from NXP.

Fun stuff.

[1] http://www.logos-electro.com/blog/2011/6/3/a-new-zigduino-application.html

may 1,000 to the 1,000th power 802.15.4 devices bloom.

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Ron K. Jeffries