This time next week, viewers across America will tune in for the big show: Not just the Super Bowl, but the ads, including a heady brew of beer commercials. The ever-busy plaintiff's bar is also ready... to serve up another round of lawsuits. On the surface, these lawsuits target alleged pitches by the alcohol industry to underage drinkers. As usual, though, what's really on trial are personal responsibility and the deep pockets of beverage makers. Class-action lawsuits filed in California and a few other states accuse alcohol companies of using provocative TV and magazine ads to push libations on youngsters....