Halaal: An article on Wikipedia on the Arabic term for "permissible".
Halal and Haram: An explanation of the concept, with a collection of articles and news items. Also (for members) a database of halal products available in N America.
Halal and Healthy: A collection of articles on halal and healthy eating in Islam, explaining the concept; also includes listings of acceptable ingredients, and discussion of related issues.
Halal Foodways: A professional chef's perspective on providing halal options acceptable to Muslim guests.
Halal Monitoring Committee: Aims to regulate and inspect Halal products from the source to the consumer. Information about their certification scheme to combat dubious or false product labelling. [UK]
Islamic Food and Nutrition Council of America: Islamic council promoting Halal food in the west.
Muslim Consumer Group: A non-profit and non-political organization incorporated as an educational organization for Muslims about Halal food, and to provide Halal certification of food products in the US.
Whatisinit.com: Allows the user to look up the ingredients of food products found in stores and restaurants. Also features explanations of technical ingredient terms.
Zabihah.com: International listings of Halal restaurants, groceries and stores.