This might be useful:
http://www.dalecozort.com/AHNewslett...WorldWarII.htm Personally, I find it more 'realistic', and much less fanciful, than the cliched "Germans suddenly unleash The Superweapons" idea.
I've also read on the 'What If?' site an alternative history idea where the Allies keep going, i.e. Patton doesn't stop, and post-war Czechosovakia is split into Czech NATO and a Slovakian Warsaw Pact halves. The Canadian's administer the Western half for a while, revive the arms industry and use upgraded Panther tanks in the Korean War and for several years later. (Some now missile armed Jadgpanthers might still be available for T2K...)