I remember the moment I first saw the trailer for "Brokeback Mountain," the movie that has captured critics' hearts. I leaned over to my wife, Faith, and gently whispered into her ear: "Well, it's about time. America has been needing a movie about gay cowboys." I've always wondered how they whiled away the long nights on the prairie. And why it took four weeks to drive the herd to market. Now we know what Tonto really meant with all that talk about his "kemo sabe."So "Brokeback Mountain" is already a classic? I think David Letterman may have put it best:...