Digg Labs

Digg has a visual representation of its data in its Digg Labs

As a story begins to attract Digg users, the Labs interface reflects the popularity of the story as a stack graph a swarm
or other display formats.

I find the display of digital data in graphical formats fascinating. One or my favorite is the Dopplr's Raumzeitgeist which maps Dopplr member's stated travel to world cities.