In the Pacific Northwest, K7ATN (Etienne) has been promoting 146.58 as the primary SOTA activation frequency for some time. Most activators now use it, though people do move back to 146.52 if it means the difference between activating and not.  At this point, most of the regular chasers monitor .58, too.  While it is not the "standard" yet it is well on its way to becoming one.  73 Bill K7WXW