there is one left in my old neighborhood. it's the Kenwood Drive-In. opens in the late spring usually and closes in the late summer/early fall. they don't have all of the old speakers though. you have to tune in to a radio signal. i actually like those crappy speakers that hook on the door or window. it was part of the experience.
i think i saw half of the movies from my childhood and teen years at the drive-in. my end of town used to have two drive-ins so... good times.