The Twitter list tool is a clever thing (even if there is no clever name for it: a "twist"?), and several folks have already gotten into the act of compiling various food talk twitter lists. There's Gastrobuzz from The Food Section, and the New York Times has not one, but four, food-related lists: Dining News, Eating in New York, Food Politics and Policy, and Foodies.
Personally, I like being the moderator of my own Twitter feeds, but if you want to play along, I've made a couple lists too:
Following Miami restaurants.
Following chefs from all over.
Let me know what I may be missing, especially on the Miami restaurants list.