Chiming in late here to say that I *love* my Macbook Air - and it was the worst model ever (the original, unrevised 1.6 GHz) machine. I agree with David about its lack of ports and slowness - this model struggles to multitask, sometimes - but it's an elegant little machine, and incredibly light and a joy to travel with. The current MBA's aren't even as fast as the cheaper baseline Macbooks, but I still think these little things are a marvel; indeed, my fully functional MBA is the main reason I've not bought an iPad (that and Apple's increasing snottiness).

David's well-reasoned, dispassionate near-abandoning of the Mac aside, my next computer will almost definitely be an MBA, too, although it will be one of the faster revisions. And Nick, if you're in the US, consider buying a refurbished one (discretely hidden away on the splash page for the Apple store, tucked into a box on the lower lefthand column). Refurbs come with the same warranty as the new computers with a significant savings.