I don't find the older keyboard layout unnatural at all, and I have no comfort issues with it. But forgetting about that for a moment, I'd be interested in your experience: after learning to use an ergonomic style keyboard, do you find it difficult to switch back and use an older style one, like on a laptop PC?

>That's exactly what the ergonomic keyboards are supposed to do. Get you out of the unnatural comfort factor of the older keyboards. There is a learning curve where you won't be as productive, but it doesn't take long to adapt.