Animation of the the 2008 arctic polar cap melt — apparently not quite as extreme as last year’s record-setter, but close. And the rate of melt in August was unprecedented.
I also like this graph that they did, showing the 2008 minimum against the historical average. They give it to you in map form and as a line graph. I might have improved the contrast in the map so that the outline of the median minimum stands out more, but that’s just me.