“The remarkable thing about my mother is that for thirty years she served us nothing but leftovers. The original meal has never been found.” ~Calvin Trillin (Copied from another site, but I forgot where I saw it!)
http://www.leftoverchef.com/ Wonderful site that lets you type in what ingredients you have around the house, then gives you recipes of what you could make with them.
http://busycooks.about.com/ Tons of info and recipes here. One of my favorite sites to get the recipes to make your own convenience foods and so much more.
http://forums.about.com/n/pfx/forum.aspx?folderId=13&listMode=13&nav=messages&webtag=ab-frugalliving This is a thread in a forum that has a lot of frugal recipes.
http://www.hillbillyhousewife.com/ Lots of recipes and information for the frugal minded.
These links should keep you busy for a while. I'll post more as I come across them. Let me know if you have some that are favorites of yours!