This one is from Cook's Illustrated (sub required), but you can also find it free here. Pretty simple recipe where the main change towards lightening things up is subbing in half and half with some corn starch to mimic the mouth feel of a heavy cream based sauce. A very successful adaptation if I am any judge, as it didn't taste "light" to me at all.
All you need is pasta, half and half, nutmeg, and some corn starch so we were going to make this during Hurricane Sandy when the restaurants started shutting down, but we didn't take out the ingredients before we lost power... not the best planning. We only were without power for about 4 hours (but we both had already had instant ramen in the meantime), so we were pretty lucky... and obviously my thoughts go out to all the people in New Jersey, New York, and elsewhere still dealing with the aftermath. I don't imagine any of those effected are really looking for recipes on the intertoobs, but, hey, if you've got a working burner you can make this... and for the rest of us, it's a really great weeknight dinner option.