Here's a blog post by by Shelly Wright (which I ran into via Will Richardson on Twitter). Great article.
ps... I've leveraged Twitter into a great source of PD and enrichment. It's turned into quite a thought provoking engine for me over the last three years. I'll write on it another time.
One thought I had... Twitter is limited to 140 characters per post. Be great if some meetings were structured that way!
Just a thought.