In DnD 4.0, the Nentir Vale is the best known setting of the "Points of Light" scenarios. I don't know if there are any others, but the vale seems a bit small, and I figure it would get swamped with adventurers coming from all over to vanquish the kobolds. I don't have a DDI subscription, so I wouldn't know from there, and maps I've found describe only the Nentir Vale.
On the same vein, where would the Shadowfell and the Feywild be? Are there maps of the Points of Light world?