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 
Well most companies now are making things with an ergonomic option. Gaming controllers for example like XBox or Playstation have these principles in mind. You can even get handheld keyboards.