Another developerWorks article, Take your ThinkPad out for a walk to create wireless site surveys:

"Use the accelerometer embedded in a ThinkPad to record your movements while monitoring your network connectivity. Use custom algorithms to extract footstep features from the recorded data, then automatically plot signal strengths on a floor-plan map to determine the best areas of coverage."

As usual with the developerWorks articles, there is a feedback form at the foot of the page.

Enjoy

Martin