Sketchcast: Sketching with Audio Voiceover

Sketchcast.com lets you recording the entire sketching process (including erasing if you want) along with audio commentary. It is sort of animated whiteboard with voiceover. You can embed this sketching/audio recording in a blog YouTube style (click on the image above for a demo). It's an interesting idea. But, I'm not sure how broadly applicable it is since it is pretty hard to draw and talk at the same time in real time and produce a coherent presentation in one shot. Some sort of editing features are needed before longer form presentations can be made by most people (e.g., me).