Greyhawk: Circles Within Circles wiki
Circles is a 4E D&D campaign using a rotating DM and episodic adventures with a grand over-all scope: the PCs are gathered by Mordenkainen in an explicit effort to change the world.
As we’re just getting started right now, you’ll probably care the most about:
The campaign Intro.
Notes on the various PC Races.
Some Maps of the world.