I use Aerons. But I've been able to make every chair I've ever used do this. It's hilarious to me to see that I've been doing the right thing all along, after about 20 years of sitting in what everyone (including me) supposed was a preposterously unergonomic posture.

Yeah, I've always felt like a slouch. I sit exactly how they recommended. Any other posture became uncomfortable quickly.

Nice to know we were right all along eh? ;)

I slouch just a bit and it never bothers me. I also tend to fidget, get up a lot, switch positions. I don't sit still very well...

Sitting still is not a natural human state. Consider that the chair is a recent invention...

You are far from abnormal.

Just follow this guy's advice:

http://news.ycombinator.com/item?id=184930

and code from a beach chair in Brazil. ;-)

Just strap your laptop to the steering wheel and put the seat back.