Omnigraffle coolness
It was Brad Delong who first turned me to Omnigraffle. It takes a couple of hours to learn and allows you to creat cool flow charts and diagrams. If you need convincing of its powers, behold this chart.
Any tool that allows the Valerie Plame mess to be summerized clearly in one page clearly deserve kudos. And kudos too, to Vanessa Bertozzi, who created the chart. More here.