If you use TiVo to skip the show and watch the commercials, you ought to visit Adland, also sometimes known as Commercial Archive, ad-rag.com and Badland (those are also now the names of Adland sections.)
The site is a center for ad-related news and discussion, posting suggestions from visitors who also offers commentary on each entry in Slashdot-like style.
Ads come from all over the globe, and for a modest $2 donation per month, you can watch the videos -- cheapskates can only get a screen capture thumbnails.
If paying to see current ads doesn't seem right, perhaps you'll be swayed by The Claymore Project, a twenty-six year archive of Superbowl advertising.
Variety - Adland is center for news - September 2003