Below is the canvas size of the iPhone and iPod touch - quite big isn’t it!
320x480 iOS Canvas size
I’ve updated the popular post we have on designing for the small screen to include some notes on the iPhone & iPod Touch screen canvas.
Just showing the screen canvas on a normal computer monitor I think is quite instructive about how much smaller it still is to a computer - but the post also shows the canvas size in relation to other mobile phones.