I will say right up front that I never really saw the point of smartbooks. They are the same basic size as a netbook, though they are a pound or so lighter. The big downside in my mind has always been the performance of a smartbook.
Inside the smartbooks netbook looking shell hides hardware with more in common with a smartphone. If you like the smartbook promise a new machine from Genesi has landed called the Efika MX Smartbook. The machine can be purchased now for $349.