Maybe it's because I'm hungry or maybe it's my need for cheese, but this week's ad of the week is brought to you by Kraft Singles. Grilled cheese sandwiches are part of a food grouping I call: an American childhood staple. I grew up dipping my grilled-to-perfection, steamy-melted cheese sandwiches into a bowl of my mother's freshly home-made tomato soup (if you've never experienced a wonder like that, you're doing it wrong). Kraft has brought that memory back to us in .gif form. Now, as we frantically search for information on Yahoo, a savory image of a smokin' grilled cheese…