This is a brief interview on NPR with David Gergen that makes a few good points about Obama, good advice he should heed. Gergen points out Obama's tendency to be the great "synthesizer" which can lead to boredom in the audience versus Bill Clinton, for example, who had a tremendous ability to generate excitement in people when he spoke. Being on the "edge of your seat" is one phrase Gergen uses to describe the experience, at least for political folks, back in the day when listening to Bill.
Found it to be insightful. But really, this is not a huge worry for Obama, it's an issue raised due to some criticism that's been making the rounds about the policy emphasis being too heavy, etc. A frivolous kind of issue to deal with, but interesting.