I actually have a laptop/tablet windows device. 13" but slightly different dimensions to the Macs which ruled out many options that are designed to fit too snugly around MBPs etc. Also the exposed tablet top means IMO it needs some decent padding, which traditional laptops don't, so no thin leather foldovers and slips for me, nice as they are.
Filson make these which I think are kind of cool.
In the end though I went with this:
Gez and the other photographers might have heard of Billingham, they make some of the best camera bags.