I must confess to a certain obsession with NPP. I certainly admire the desire to place all of Holy Writ in its historical context. Even if that means going against the status quo: since many in evangelical Christendom often see the Bible as though it were written in a vacuum, and dropped from the sky (a somewhat pagan notion, in my opinion: see the statue of Artemis in Acts 19). If we're going to champion an "historical/grammatical hermeneutic," we need to be consistent. And I can honestly say I've learned much from my study of NPP (both pro and con).
That being said, I have serious reservations about NPP, especially in regards to the doctrines of Justification, Eternal Security, and Imputation. One need exercise great discernment when opening up such material.
Nonetheless, I believe this interview with Tom Wright - aside from further revealing his winsome, likable character - allows the man to condense things in an easily digestible way for the casual reader. If your exposure to NPP is limited, this would probably be a good place to start.
Read the full transcript here.