Here's a useful tool for developers who want to sketch out UI ideas for iPhone apps. These clever Post-It Notes from Apps-on and 3M have a 20 pixel grid on the drawing surface, and feature the exact dimensions of the iPhone 4. So, you can draw your ideas in a perfect 1:1 scale. There are 50 sheets per pad, so don't be afraid to toss bad ideas into the trash.
They're available in three packs: the Starter offers 5 pads for US$20, the Pro offers 10 for $35 and finally you can get 20 pads for $59 by choosing the Master pack. Heck, I'm not a developer but I'd use them as plain old Post-Its!
This isn't the first example of this type of thing that we've seen.
