NYT has a cool article that lets you track the evolution of Super Bowl TV commercials from 1984 through 2006.
Browse the gamut from the Apple 1984-esque Mac launch to Spuds Mackenzie to the Tabasco mosquito to the Pets.com (who?) sock puppet to Budweiser’s "Wassup!" and beyond.
For more interesting reading, here is another New York Times article on the subject of Super Bowl ads entitled "Colts and Bears and Kevin Federline" with some interesting charts, videos and stats.