Excellent stuff, with videos. You could do worth with your time than learn to communicate visually. Many people have a phobia of grabbing a pen and sketching something, when in reality, it's all a matter of practice, and most people can learn to make basically useful sketches.
This is not to say that we can all become supremely talented at it (like the author of this article, Peiter Buick), but basic drawing skills are within anyone's reach.
Read more about sketching and watch a cool video here.