This document provides an overview of SketchFlow, a tool for quickly sketching and prototyping interactive applications. SketchFlow aims to lower the costs of the design process by enabling designers to rapidly explore ideas through disposable prototypes. It allows recycling of layouts, controls, animations and components to facilitate fast iteration. The document discusses how SketchFlow helps communicate design intent, collect feedback, and deliver compelling proposals to clients in a quick and cost-effective manner through rich yet inexpensive prototypes.