I've been scribbling in a notebook for a while now about various iphone ideas, and recently started sketching a few ipad apps as well and thought "I should make some templates that are about the same physical size as these devices so I can sketch the UI more effectively".
Turns out there's other people who thought the same thing, and already made them freely available! Thanks very much guys! You can grab them through the links below;
Andrew just sent me this link to the Pixel Pad - the organic version of the iPad - nice idea!