Both campaigns have begun planning their respective strategies for the the next six months, per the New York Times:

Even before Mr. Obama fully wraps up the Democratic presidential nomination, he and Mr. McCain, the presumptive Republican nominee, are starting to assemble teams in the key battlegrounds, develop negative advertising and engage each other in earnest on the issues and a combustible mix of other topics, including age and patriotism.

I found the part about unmoderated debates to be particularly interesting:

The two men also have sought to build their candidacies around images of reform, unconstrained by traditional political molds. The rivals are openly discussing staging forums across the country to speak directly to voters, an idea that is by any measure unconventional for a general election campaign.