From Erik's blog post about the sketchnote:
Sketchnotes are a really interesting visual way to capture a story. They are made live, as the story is told. An image can capture a huge amount of information. It is much easier to re-tell the story using sketchnotes than it would be using written notes, as the images help you to remember what has been said. More clues for the brain means better recollection! Don’t you want to keep your story alive and fresh?
Great work Erik!