This may be one of the most useful fantasy setting guides on the market for several reasons.
1 - It was apparently designed in particular for the D&D 4E rules but is written in such a way that any rules set would work with the setting.
2 - The settings (there are four of them) are detailed enough to get a GM started but not overburdened with detail giving the GM increased latitude for making the setting his own.
3 - The regions outlined are sizable chunks of geography but are small enough to easily slip into any existing world setting.
4 - The maps are easy to use and easy to manage.
In many regards, this book is the opposite of Monte Cook's Ptolus campaign which set the standard a detailed fantasy setting. Whereas Ptolus was a fully formed body complete with muscles and nerves, Points of Light is a fully articulated skeleton that can be the framework for incredible gaming!