iPod touch Spirit level for Touch?

Anyone thought about a spirit level app for the Touch.

If you've ever put up shelves or any other simple DIY activity you'll have used one those little yellow glass tubes filled liquid and with a bubble in it to get your shelves level. Effective, if a bit analog!

Since the Touch has an acceleromter, how much more cool would it be to have a yellow screen with a little image of a bubble which moves around according to how level the Touch is? If you had markings in the centre of the screen you could place your Touch on your shelves and adjust them till the bubble was dead center - and your shelves where level.

Touch = totally brilliant digital spirit level which plays music and videos too!

Now "all" we need is someone to code it...

I am not sure you are correct that it wouldn't work:

If you have a play with the Sensor app you'll see that the measurements for roll and pitch persist even when the Touch is not moving. Essentially the spirit level app would be taking this data and presenting it visually.

It is called an accelerometer though, so one would assume that it measures acceleration....