Okay, I have to play devil's advocate here. I love the Progressive commercials. Advertising is in my line of work, and she's obviously memorable so they are doing a good job. My wife and I love the one where the poor hen-pecked guy is wearing the "European shoulder bag" given to him by his wife.
I love the Geico commercials with the gecko, too--not the ones with the cavemen though. My favorite of the gecko is relatively new where they mention that someone thinks he's from the UK and someone else thinks he's from Australia, and he says something along the lines of, "Funny you should mention that. I'm actually from..." and then they cut it off. My wife and I were practically going, "AAAAAAAHH!" after we saw it.