The Region also has an interesting article (by Ronald A. Wirtz) on the growth of Regional Trade Agreements, and the controversy about their effectiveness: woodrow.mpls.frb.fed.us/pubs/region/04-09/wirtz.cfm
This is the second post related to this publication. In fact -- just take a look at the table of contents: woodrow.mpls.frb.fed.us/pubs/region/04-09/. The whole thing is worth reading.