Part of my work involves making mockups of websites for clients, and up until this point the easiest way to do that was just to hand draw some sketches, scan them, send them to the client for rework, etc... Now there's a new iPad app from developer Nick Golovin that promises to make the creation of website and app mockups a lot easier.
SketchyPad (US$4.99) is an iPad app using a simple sketchpad metaphor and a lot of stencils to make mockups. It includes many of the design elements that are used in web design and app development. The app includes snap-to bluelines for aligning elements, the stencils can be locked in place with a lock icon, and there are tools for layering buttons and other elements on the page. When you're done with a sketch, it can be exported to your camera roll, emailed, or exported to Balsamiq Mockups for Desktop.