They say it every night, regardless of what we're serving (I mean, as long as it's not kids' choice): "I don't like that."
Right now we have a deal with Sam: if he eats every night this week, we'll get him a DS. We were talking about getting it for him anyway, for our trip to PA later this month, so I don't know what we'll do if he doesn't eat; but so far just a reminder of what he can earn is enough to get him to stop protesting and eat.
In the few months since I started this blog, feeding Sam has become slightly easier and feeding Kate has become significantly more difficult. Sometimes I think she isn't needing as much food as she used to. More often I think that she's so busy exercising her will, pushing us whenever she gets a chance, that she can't stop even if she is hungry at dinner. Typically, if we get a bite in her mouth (especially meat; she's very resistant to meat but when she gets a taste, she gobbles it) she'll finish. So stop fighting us already.
I am finidng it easier to stay firm and insist they eat what's served. I don't cave as easily as I used to, offering cereal or something. My mantra can stand up to theirs: This is what we're having. Eat.