When the weather's just right, we like to sip a vodka martini on the perfectly appointed patio at AZ 88, with the rest of the beautiful people. When it's too hot, we'll crowd up against them at the bar. Last time we were there, it drizzled, but instead of ushering the B.P.s indoors, the staff handed out black umbrellas, a charming touch, and not surprising, given that attention to detail -- from the ever-changing art to the coffee bean in the espresso martini -- is a hallmark of this Scottsdale establishment. We held our breath, hoping no one skidded on high heels or leather-soled loafers on the slick marble floor. But everyone glided.