Ellabee's idea is a good one -- I also keep a Bookmark for recipes I don't want to cook again -- I call it 'X-Rated' so that it's always listed at the very bottom of my alphabetical list of bookmarks. I have another suggestion as well. When you discover a recipe that you don't like, give it a very low star rating. Then, when you search, ask for the search to be sorted by 'Rating.' That way, recipes with a low number of stars will appear below those with a high number. This only goes so far, though, since any recipes that haven't been rated at all will appear below the low-star recipes.