I could never find many decent explanations of how to do oversampling with an Arduino, and it has been bugging me for a while as the technique seemed like such a good idea.

So I decided to do something about it:

Enhancing Arduino ADC resolution with Dithering & Oversampling

Now before the old hands pat me on the head, saying "That's nice dear..." I just want to mention that it took more test runs than I even want to think about to get this stuff sorted out. So if that information was all lying around somewhere the whole time, and I just missed it... don't tell me about it... I don't think I could handle the news :-)