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