Dean Reynolds of CBS has written a very interesting piece contrasting the inner-workings of the two campaigns. I found this to ring especially true:
The McCain folks are more helpful and generally friendly. The schedules are printed on actual books you can hold in your hand, read, and then plan accordingly. The press aides are more knowledgeable and useful to us in the news media. The events are designed with a better eye, and for the simple needs of the press corps. When he is available, John McCain is friendly and loquacious. Obama holds news conferences, but seldom banters with the reporters who've been following him for thousands of miles around the country. Go figure.