Just writing more iPhone stuff and managed to create my very own UIView subclass to display some data to the screen.
The control display the min, max and mean of a range of numerical results from 0.0 to 10.0.
It's a bar that look a bit like this...
[----|===========X==|-----------------]
Where the full bar goes from 0 to 10, the shaded area is the min-max range and the X is the mean.
It's written so that it takes the 3 numbers in and calculates where everything goes and.
Never done anything like that before so I'm quite chuffed

It worked first time also
