Clematis Street is still out there trying, but it has nothing on Atlantic Avenue. This once-struggling thoroughfare virtually teems with eateries of every type, from haute Mexican to modern American to classic oyster bar. Interested in Italian? You got it. Crave a coffeehouse? That too. Perhaps even more significant are the extensions of the restaurant row. Now that it's practically filled up, side streets and off-the-beaten-track neighborhoods are benefiting from the spillover, and Japanese, Thai, and Middle-Eastern places are popping up all over. Note to Clematis: What is the holdup? You have the example, now follow it!