In Robert Harris’ novel Fatherland (the basis for a 1994 TV movie), Nazi Germany successfully invades Russia in 1942. Learning that Britain has broken the Enigma code, however, the Nazis play it safe and make peace with the west. Through the magic of propaganda, Hitler is revered 20 years later as a beloved leader. It’s an alternate history, of course, but Harris was drawing a parallel with real history: this was Stalin’s Russia with the names changed.
So what would be today's ripples in history if Hitler successfully invades Russia?
I wrote a reply to this topic in the facebook post and I'll gladly offer my insight here also. Bit I'm too lazy to write it all out again, so I'll offer a snippet instead. :)