I'm 6ft 2 and weigh 200 pounds, a 13" white MacBook is not a lot for me to carry. Would I buy the Air if I had the money? Yes to go alongside a Mac Pro, but not as a primary computer.
I love the Air, I think it fits its market incredibly well. It's the fastest, best priced device in it's category. But I don't need it.
The current 13" MBP, with the Air quality screen, speed and 8 hour battery would be my ideal laptop. In fact the current 13" MBP, is in my opinion, is the best laptop anyone has ever made. It's lightweight, fast, cheap (for what it is), has a ridiculously long battery life, excellent screen, beautiful aesthetics. There's just not a lot more I can say, it is the perfect laptop, I don't see how anyone could not like it. It is the pinnacle of human achievement.