The Air doesn't have an optical drive. You can get an external that connects to the USB. Optical drives are becoming useless and integrated ones are a waste of space on a laptop.
The Air is only good for the people who want things like a netbook, its honestly not worth the price. But for people who enjoy the look, I can see the appeal, also OSX isnt a bad OS. But the Lack of Storage Space and The older CPU. I persoanly say stick to a laptop, if you want a laptop.
I'm really hoping they throw a dvd rom into their super combo wireless router at some point. I am not going to consider one of those if I have to go digging through my accessory drawer if I want to watch a dvd.