What kind of seating do you find best for studying, programming, or general computer work? I'm not necessarily looking for specific products, but more like features, sitting positions, etc. I know ergonomics is a big field, but I couldn't find much about this particular topic. Personally, I like sitting in a reclined position for long sessions on a laptop. I haven't experimented with one yet, but I've been anxious to try using an over-bed desk/table like you see in hospitals. What do you use? Do you know of any research in this area?
I guess it depends on what you mean by “productivity.” If that comes from quantity of typing you can optimize for that. 90% of my productive work happens in my head, maybe while laying on the sofa, maybe when out for a walk. I doubt my chair has much to do with it.