That's a map of all the posts to the overchan.test board, by volume. It can do more than one group at a time too. Configure your server and groups in map.py and run it, it will dump all of its output to a file called "test." Pipe test into neato to create a graph as an SVG.
Some other maps
ctl
a mix of ctl and half of o.test
o.random, o.test and ctl
