Saw this today on Ars. Not sure how great it would be as an office chair (at least if you attempt to use it with a desk). But as a gamer/laptop chair, looks fairly cool.
[ Perhaps... a lot of money for that though.
"It's a chair! But you can make it into a much SHORTER chair that rocks back and forth, you know, if you want."
TreyChair.com - Multifunction task chairs for your desk, floor, home, or office.