This is pretty cool. The Boston Globe put together a visual composite of the most-used words on John McCain and Barack Obama's respective campaign websites. It should come as no surprise that John McCain's message is overwhelmingly about Obama and overwhelmingly negative. Seriously, just compare the top 4 words on each; it tells you all you need to know about this election.
Sean at 538.com offers some analysis on the desperation of McCain's media strategy.