I went to a cool talk (video should eventually be available) at UW by Jeffery Heer, developer of the prefuse visualization toolkit, at Berkeley's Visualization Lab.
His Flare toolkit, a flash-based follow-on to prefuse, also seems to validate my desire to ditch Java for this sort of thing and move to Adobe's platform (flash/flex/AIR).
Mentioned during the talk were: GapMinder, ManyEyes
A related class at Berkeley on infoviz. I suppose, if I get interested in this stuff, I ought to read those Tufte books.