i love ergonomic keyboards and chairs. They're designed to minimize muscle strain, and i think that's an important issue today!
wow, tell me more 
Well for a good keyboard, I use one in the shape of a V so that both my hands can be at an angle, and it's more natural. No more muscle strain!
when did this trend start?
Well there was a contoured keyboard developed in 1977 that changed the arrangement of the keys to shoulder width!
Which company have the best of these ?
I believe it was called Maltron. In their configuration you didn't really need to move your arms or wrists. 
Ok which hardware company as we speak follow this
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Handheld ergonomic keyboards are designed to be held like a game controller, and can be used as such, instead of laid out flat on top of a table surface. They allow the user the ability to move around a room or to lean back on a chair while also being able to type in front or away from the computer. Some variations of handheld ergonomic keyboards also include a trackball mouse that allow mouse movement and typing included in one handheld device.
Types Angle split keyboard.
The angled split keyboard (
Ergonomic keyboard
An ergonomic keyboard is a computer keyboard designed with ergonomic considerations to minimize muscle strain and a host of related problems. Typically such keyboards for two-handed typists are constructed in a V shape, to allow right and left hands to type at a slight angle more natural to the human form.
Types.
Types Split keyboard.
A "fixed-split keyboard" is a single board, with the keys separated into two or three groups, allowing the user to type at a different angle than the