We run group tests all the time at Macworld, but we haven't done one quite like Jason Kottke's most recent 'product' comparison.

"Much of the past four weeks," he writes, "has been spent determining which has the most sensitive built-in accelerometer: an iPhone, a Nintendo Wiimote, or our newborn son."

The accelerometer is the gizmo that senses motion. The iPhone's senses when you rotate it to look at a landscape picture, the Wiiremote's senses when you hit a blinding cross-court forehand winner, and little baby Ollie flails his arms around when he thinks he might be falling backwards. Apparently, this is called the Moro reflex.

Read Kotke's full blog entry here.