Adobe has been working on a pen and ruler for tablets, and the combination looks awesome.
The pen is pressure-sensitive, but the coolest part is the “ruler,” which allows you to draw straight lines or precise arcs. Really, really cool.
The demonstration, though, shows a very large lag between drawing and the line actually appearing on screen. It’s strange because it’s much, much worse than I’ve experienced with any drawing or sketching app on iOS.
In any case, it’s heartening to see Adobe working on meaningful projects like this.