I think the new Honda Problem Playground site one of my most favorite new sites. It offers a unique means of navigation by following a road map and dragging the screen to move about.
Another example of this site's quirkiness is that before users can play the video to see the new FCX car in action, they are required to first assemble a simple puzzle (of the video's first frame) beforehand. Not to mention the entire experience is helped along by tiny little people who lift, move and pull the pieces of content along.
And it's sure nice to see how Honda is harnessing hydrogen power for mass market (proposed) automobile production.