Kathy Sierra is one of my all-time favourite bloggers. Her blog title (Creating Passionate Users) is very apt, considering the level of her own passion. While she moves in very different circles from me, many of the points she makes translate perfectly to the world of a learning designer. Today's post is about usability and fun, and makes a compelling argument (as Kathy usually does!). It was well-timed, too, since we recently had a team day at work, and one of the sessions dealt with usability, touching on the same Jakob Nielsen points that Kathy mentions.