my main machine is a 4gb 13" MBA, I do heavy web development with music playing and photoshop open all day long, along with skype, and the thing never skips a b

my main machine is a 4gb 13" MBA, I do heavy web development with music playing and photoshop open all day long, along with skype, and the thing never skips a beat. 6 hours of battery even after 9 months, weighs less than 3 pounds. It's the best computer I've ever owned. And it's my first Mac, I'm not much of a fanboy.