This app is nothing special but I made it to get an idea of what sorts of values the alpha, beta and gamma feedback. It is made for use with a tablet or phone of some kind with an accelerometer inside.
If you want to give it a go you can just open up this zip in cocoonjs: dl.dropboxusercontent.com/u/204115655/deviceorientation.zip
And a screenshot:
<img src="http://i.imgur.com/eEG3xbn.png" border="0" />