My favorite site to use when planning meals if Kraftfoods website. It has an option that you can type in one or two ingredients that you have in the house, and it will give you a list of recipes that use those ingredients. Very nice when you are on a budget. And my family really likes most of the recipes I get from here.
Right now, if you sign up for their email list, you can print up to $50 in Kraft coupons. (Lots of $1 off 1 item coupons)