Every time CBS ran a promo for one of its own shows, I kept thinking "What? CBS couldn't sell that spot? Its the Super Bowl! The most highly watched sporting event in America!"
My favs:
The Chrysler commercial where the guy had a monkey on his back - "I've got to find a family car that's cool." And introduces the new Dodge Magnum. (which does look cool).

The Bud Light talking monkey. Guy has his date over and she's on the couch. He gets up to get a Bud Light and his pet monkey sits down next to her and starts talking. She says "You can talk!" and he looks her up and down and replies "Yeah baby, I can talk. And I can do a lot of other things, too." Pure comedy genius.
The Orange County Chopper guys doing the spots for AOL's new service. America has a new comedy trio with Paul Sr., Paul Jr., and Mikey. "We got this new piece of equipment in the shop, so Paulie decided to install it on this new bike he's building..."