Matt Gemmell:

Responsive testing, though, is something you actually can do on the iPad, up to a point, with Web Tools. It lets you resize the viewport, or choose from a set of popular device sizes, and it also has a rudimentary built-in web inspector with DOM tree and editable CSS attributes (and a JavaScript console, as an in-app purchase). It’s basic, but you can readily use it to see how your site responds as the browser window resizes, or on different screen sizes than your own.

I hadn’t heard about Web Tools until reading this piece, but it looks like a great app. I’ll have to give it a try next time I’m in front of my iPad with some time to kill.