Dave Trott was, is and always will be an advertising legend. His Blog is spilling grade A advertising experience onto internet screens around the world for free and not only that, unlike when I was getting into the advertising business, you can engage in dialogue with him if your comments are in shape.
If you're not sucking on his RSS feed yet, you should be. It's not too late either to go through the archives without sacrificing a whole weekend. It's worth it.