Last hurrah for the brawny American car?

With its diverse blend of concept cars, luxury rides and economic vehicles, New York?s auto show usually puts some zing into the auto show circuit. This year?s show, with its focus on muscle and power, signified nothing less than the end of an era for some who attended its preview days last week. ?Everyone is talking about how this show is irrelevant because it?s all about muscle cars," said John Wolkonowicz, senior markets analyst at Global Insight?s Automotive Group. "But it?s not because we are witnessing the end of an era that will be remembered fondly for years to come."