I read a bunch of these before I realized there was a 5 year skip in the thread. I haven't sworn off TV completely, but I watch so little that people mention lots of commercials I've never seen.

Favorites? I'll add the bread commercial Liz Cornish linked to my list. I've always like the first Kodak "True Colors" commercial I remember, with what I considered a beautiful Choral arrangement.

Worst? in no particular order: Any feminine napkin ad; a pecker-picker-upper ad with "Bob", who looks like he must have an erection so big it stretches his face into a grotesque, mummified grimace; and two from radio years ago: one ad for a Chicago nightspot, which advertised all you could drink for the price of admission on party nights, and always mentioned that the location was convenient to the expressway; One ad for brake repair (Don Firth, I may hate you if you inspired this) would come on day after day, as I drove home in bumper to bumper dodgem cars on a Chicago expressway and hit you dead cold with the sound of screaming brakes. I never quite filled my pants before I realized the sound was from the radio, but I came close.