Can't get enough? Here are a few more great resources not mentioned, if you want dig deeper into Sketching user interfaces and interaction.
- "Why We Sketch," by Jared Spool. User Interface Engineering.
- "Sketch Sketch Sketch," by Joshua Brewer. 52 Weeks of UX
- "Forms, Fields and Flows," byDave Gray
- Brain Doodles, Visual Thinking Tutorials.
- "Think You Can't Draw? Here Are 6 Artists Whose Work Will Help!" by David Barnes.
- Konigi articles on Sketching.