The World Trade Organisation has information on WTO agreements and disputes processes. The WTO has responded to criticism in a document on their website called "10 common misunderstandings about the WTO" which is an interesting PR exercise.

The International Centre for Trade and Sustainable Development produces a monthly trade bulletin called Bridges Trade Digest, available on their website.

Public Citizen (USA) have produced two booklets on the WTO, the latest of which is Whose Trade Organisation? Corporate Globalisation and the Erosion of Democracy, which can be ordered through their website.

Focus on the Global South (Bangkok) produces a useful bulletin called Focus on Trade which is on their website.

The Council of Canadians has useful material on the WTO, GATS and on regional trade agreements like NAFTA and FTAA.