I thought this pdf might be useful for food bloggers troubled by the ins and outs of recipe copyright as we sometimes are at Tomato. It's for Australia but the principles should apply to most countries. We all are influenced by various chefs and cookbooks and it may clear up some confusion (or make it worse)
The important thing is that you can't copy a recipe from another site or book (unless perhaps its creative commons) without permission. However, if the recipe is generic or very simple it is unlikely that copyright can be infringed.