fahrstuhl said:
			
		
	
	
		
		
			BTW,  speaking of the touchscreen... Are these actually capable of  recognizing variable pressure? Or do they just have 'click' and  'no-click'?
		
		
	 
I've been messing around with the driver,  and yes it can do some pressure sensing, returns around 16 different  values for pressure.
For those interested how it will be  exposed, it will be (already is, actually) accessible through standard  Linux event interface (raw values), or tslib (calibrated).   
Doesn't answer the scale question, but interesting info none the less.
chip pretty much answered it... maybe it will work, but you would need a fixed-size object between the weight and the display. Also, the display must be recalibrated before pretty much every usage.
Nobody really knows the scale and the steps it can detect, so wait for the final device. 
Writing a program for this function shouldn't be too hard.