I just came across a vast list of restaurants that routinely offer free or discounted meals for kids (variously defined). This might take a little effort, because you need to pay attention to the age limits, the days of the week, and of course always call ahead to see if our local restaurant offers the promotion (which they are not obligated to do).
But if you're looking to save some money when you take the kids out for dinner, this is a great place to check.
(Link found at the Frugal Living blog.)