I always chucked at the jealousy argument, because it's just another way of admitting discriminatory pay practices. If people are paid the same for the same work, nothing to be jealous about.
I had a manager once argue that equal pay for equal work just inspires people to slack off. I contend that being joblessafter being fired for being a slacker is motivation enough to earn that equal pay by doing equal work.

Macbook Air isn't just about the weight, the processor/horsepower are a draw. I have to wonder if LG can compete with Apple's performance, rather than just making a lighter laptop. The Macbook Air is already quite light. The Macbook Pro is a beast.