Not sure the Mac App Store will be as huge a hit as some predict. I do think it will help get some smaller developers in the house, but larger corporations (hello Adobe) already offer their software available in downloadable form and they don't have to give Apple a 30% cut of the sales either. Never have been a fan of the MBA, but I might have to bite with the better battery life and extra USB port. I love my 15-inch MBP and wouldn't get rid of it, but after carrying one back and forth to the office every day for years, it gets to be a bit of a drag. The only apps I use that require a lot of horsepower are Aperture and Photoshop. If I could get around that fact that I don't need those apps with me at all times (although it is damned convenient) then I could see myself using an MBA daily.