I would absolutely love to one day just carry one device with me for everything. But, until then, I've got an iMac at home, an MBA for the road and an iPad for all of the above. I tried replacing my iPad with an MBA, but there are just certain tasks where a tablet form factor is much more convenient, most of these involving consumption. If I want to get some serious work done, out comes my MBA.
But, I have to say, of all of my devices it's the MBA that gets used the least.
But, I have to say, of all of my devices it's the MBA that gets used the least.