I'm a huge fan of visualizing data. You can show me piles of numbers and I'll just fall asleep, but Pretty Pictures--now that's what I'm talking about. If a picture is worth a thousand words, a good graph is worth a billion numbers.
Hans Rosling gave a talk at Ted that touches on the visual display of global statistics over time that had me riveted to my monitor. Watch it if you haven't already--it will be the best 19 minutes you spend all week: