This link may be helpful: http://mousetrips.com/WDWDining.html
I'm not sure if you have a boy, girl or both. If they are both girls you should try Cinderella's Royal Table. You eat inside the castle and the prinesses are there. Chef Mickey's is also great, you will see the gang there, so the kids would love that.
Depending on when you are going a new breakfast is supposed to be coming out ,Breakfast and Beyond, in April. This will feature characters from Toy Story. Ohana's is also a lot of fun.
If you are looking for non-character meals, Sci Fi is great and so is 50s prime time. All of them have really great food. If you are looking for a good value then you should try Beaches and Cream at Beach Club, the food is delicious and the prices are really good as well. Kids also have a lot of fun at Whispering Canyon.
Really, you can't go wrong with the food at Disney. They have so many choices and kids can pretty much find something they like anywhere. I definately recommend doing a few character meals for the kids, these are a lot of fun and allow more interaction with characters than you can get in the parks.
Hope this helps