XP, Vista or 2007 or a Standard for OS

It looks more like filling more into pockets of Mr. gates when you try products like windows vista and windows 2007 vis-a-vis windows-XP. Actually from last few years the user’s are being fooled to pay for a revised interface. The writer for this matter is into the training business and may be good to start new classes in every operating system. But somehow the conscious doesn’t allow that every time someone is forced to buy a new operating system and earn more money for training more about just revised interfaces. I think it is high time a standard for OS evolves which makes sure that even the user interface keeps slowly evolving without just changing the design gimmicks.