A Developer Laptop. Think 'Macbook Air' for developers (open-source devs, .NET guys won't benefit much from this) installed with an operating system without all the usual bloatware. Don't get me wrong the Macbook Air is a great machine, but it obviously has too much 'Apple stuff' on it that I don't use very much at all. Officemates told me that the closest to a great developer laptop is the Dellbook XPS13.
System76 is quite good, although somewhat pricey (less than Apple though).