I realise I'm late to this party, but I've recently begun to sketchnote. I've had Mike Rohde's Sketchnote Handbook for quite a while but hadn't gotten around to read more than the first couple of pages.
What motivated me to try it out now is my new toy: I got myself a Wacom Bamboo Spark. This is due to me being interested in bridging the gap between analogue and digital note taking and brainstorming. As mentioned in an earlier article, I am a huge proponent of doing things "offline" and "analogue", i.e. on paper, first. But at some point, you will run into the problem of having to take your notes with you or you will want to transfer them into some digital format for further use and processing.