In the UK the front brake is always on the right. I'm so used to it now that I don't want to switch but it strikes me that logically that is the wrong way around. The front brake is the one with the best stopping power so if I have to have one hand off the bars for signalling then ideally I'd want to be braking front wheel only, not back wheel only. Obviously when signalling a turn you could have either hand off the bars but, since we ride on the left over here, I feel it is more important to signal right turns than left ones so therefore I would want to still be able to use the front brake when turning right. For those who ride on the other side of the road it would be the other way around.
My first recumbent had been put together the other way. Initially I thought I'd get used to it but after an emergency stop when I put the bike into a lurid slide because my reactions were all wrong I decided it made sense to keep all my bikes the same and swapped them over.
John