Some great suggestions from the Philanthropy Potluck Blog on story telling with data. Short and sensible recommendations include starting by answering some questions then determine the right type of graphic. Eliminate clutter (my favorite), draw attention where you want it, tell a visual story and practice. And all these means that you can't wait until the very last minute to write that report or impact statement! Thinking about data presentation should be part of your evaluation process from the start.