The Electronic Freedom Foundation has published a legal guide for bloggers that anyone who sees fit to publish their own delusional rants on the web should be familiar with.
Because of the nature of the topics covered, much of the guide is focused on political bloggers, but many of the issues covered apply to just about anyone writing on the web. That includes us foodie types.
The guide is written for U.S. laws, but the priciples should be useful for writers from just about any liberal Western democracy. Those of you in Saudi Arabia or North Korea - you're on your own.