"Time for Change" journal does a good job at reviewing them in detail:
http://journals.democraticunderground.com/Time%20for%20change/308 .
Here's my take on the big two issues:
War = McCainy plans to continue the Iraq war, but will discuss strategic errors during the campaign to sustain his maverick image. "See, he agrees that Bush made mistakes. Golly gee, he's different." Obama = begin withdrawal of troops from Iraq. Begin roll back of disastrous privatization of the military and the subsequent war profiteering promoted by Dick Cheney. Rebuild military and intelligence agency reputation and capacities and restore U.S. adherence to international legal and human rights standards.
Economy = McCainy supports making Bush tax cut to the super rich permanent and will call its repeal when promoted by Obama as "the largest tax increase in U.S. history," in spite of Bush's shameless admission that middle class tax breaks work best with his $600 check distribution.