The sister product to the amazing Herman Miller Embody chair, the Envelop desk actually slides out and down on rails to give you the correct angle for working while in incline. It's amazing.
It doesn't sound like too much - desks are desks, right? - but it actually makes as much sense to pair a desk and chair together as a computer and peripheral. If they work together, they can elevate the whole product. The desk is selling by itself now for $US1100, but they'll probably pair it together (with a little discount) sometime later this year. Check out this video to get a real sense of how it works, and take my word for it: This thing is comfy in a serious way.