Some national movie chains continue to shrink, while others focus on constructing mammoth multiplexes. Our Best Movie Theater of two years ago, meanwhile, has survived by morphing into that rarity, a true independent. The Gateway still snags the occasional mainstream flick, but it has become the best bet for such edgy independent fare as Requiem for a Dream, Nurse Betty, and the recent Memento. More specifically it has become a haven for the small but thriving genre of queer cinema. Edge of Seventeen, Trick, The Broken Hearts Club, Boys Life 3, and the Oscar-nominated Before Night Falls are just a few of the gay-oriented flicks that have played there. And a corner of the theater's lobby has become a virtual gay community-resource center, featuring magazines, newsletters, fliers, brochures, and business cards. No wonder some members of the gay and lesbian communities refer to the Gateway as the Gayway.