This past month's cover story of Christianity Today was, "What Did Paul Really Mean? 'New perspective' scholars argue that we need, well, a new perspective on justification by faith" by Simon Gathercole.
It is a good overview of the main issues involved in the New Perspective theology from scholars like E.P. Sanders, James D.G. Dunn, and N.T. Wright.
Scot McKnight is another scholar in the New Perspective camp (having studied under Dunn). As an insider on the subject, he offers his perspective on the new perspective.
With Scot's blessing, the series is offered here at Vanguard Church as a pdf file.
Download it here: Understanding the New Perspective on Paul by Scot McKnight