superb treemap
What Your Global Neighbors Are Buying is a superb use of a treemap.
It benefits from the added visual structure of relative placement of the countries; placement is something most treemaps don't benefit from.
And the subtlety of the colour gradient is really nicely done; the overall effect is one of initially very simple mapping effect, but has a decent amount of depth (particularly from enabling comparisons).
Via Daring Fireball.
