Banner ads don’t work. Everyone knows it. The online advertising industry, however, doesn’t want to admit it. Just a few days ago there was a big meeting of members of the Internet Advertising Bureau—a self-selected group of big web sites and ad banner hucksters, including Yahoo, AOL, DoubleClick and Excite. These towering intellects have decided that the reason ad banners don’t work is that they’re not big enough. So they’ve decided on some new standards for ad banner sizes.