Scot McKnight, over at his Jesus Creed blog, has recently posted several entries summarizing and clearly explaining the history and claims of both the New Perspective on Paul and the Historical Jesus Quest.
I encourage everyone interested in getting a better grasp on what these things are all about to read these entries in full. Here they are:
Here is a PDF version of all five blog entries on the NPP.
To supplement the above reading I would also recommend the following articles:
What Did Paul Really Mean? by Simon Gathercole
Further Reading on the New Perspective by Simon Gathercole
What Did Simon Gathercole â€” and Moses â€” Really Mean? by Andrew Sandlin