The big broadcast nets are beginning to book their first big upfront deals — deals that are showing signs of today’s complex media world. Technology innovation continues to drive media fragmentation, muddying the once-simple world of TV, radio and print. Advertisers must now divide their budgets among all the proliferating devices and channels people watch. How can they hope to get the return they are used to in terms of what people buy? And how can the broadcast nets and other media companies offer such a return? Certainly, this revolution in technology is complicating our lives. But we believe this same technological revolution is going to make it possible for advertising to enjoy a renaissance of sorts…