The "Best Food Weblog" award program at Accidental Hedonist has several categories. For example, one category will honor weblogs that cover the food industry. Barbara from Tigers and Strawberries and Jack from Fork & Bottle both nominated U.S. Food Policy in this category.
Elise nominated Life Begins @ 30, which tackled local food issues with an engaging campaign last summer. I don't know if Accidental Hedonist and Calorie Lab are excluded from eligibility, due to their role in hosting the awards, but these are both important relevant weblogs. I also like Fast Food Facts. Tom Philpott's Bitter Greens Journal would be a good choice, but it has been dormant, as Philpott has an even more interesting gig writing for Grist.