Iskelter Slate. My wife has one of these and it is fantastic. Build quality is excellent. Hand made bamboo.
They're also making a gamer specific one with more surface area, they're kickstarting it right now (they got their start with the other models on kickstarter as well).
Hover-X
They're also making a gamer specific one with more surface area, they're kickstarting it right now (they got their start with the other models on kickstarter as well).
Hover-X