Superbowl success?

Not necessarily a major Internet event, but it appears superbowl releated web sites did well this year. According to Keynote's press release http://biz.yahoo.com/bw/000202/ca_keynote_1.html only one superbowl advertisor web site out of 35 was inaccessible during the superbowl. I didn't notice any significant correlation between the network provider and the performance of the web site. Are folks getting better at predicting advertising generated traffic? Or are people just massively over-provising their web sites, and praying?