1366 : 768 was only used by the tv-manufactuers because they could not build 1080p displays at that time, and they had to build something "better" than 720p displays.
but dont be fooled. this res is no HD standard.
Actually the real reason why such "odd" resolution was used is that same panels could be cut into smaller 1366x and full HD res pieces and there fore lowering the manufacturing costs (32", 37" used 1366 and 40+ in many cases were using full HD).
Norway