Herman Miller has a very space age office chair in their line-up dubbed Embody. Gizmodo just tested the ergonomic chair and calls it the best Chair they ever sat on.
Quote from the review: "The most important part, though, is the backrest. Herman Miller claims that "a matrix of pixels creates dynamic seat-and-back surfaces that automatically conform to your every movement and distribute your weight evenly." They claim that this will reduce stress, help circulation, lower your heart rate, improve your posture and pretty much make you a better worker. Does it work?"
Read the full review on Gizmodo.

I am still very, very happy with my Human Scale Freedom Chair. It is perfect for the believers in the slump style, which is supposedly much better for your spine.