A following Delta flight reported ice "about a 1/4 inch on us from descent" not building, US Air reported picking up ice for about 10 minutes but coming off around 2300, another reported ice from 20 miles south of airport.
Approach controllers soliciting icing reports, alerting on possible localizer problems (although noting they weren't indicating problems), and in general reflected tremendous professionalism under circumstances. They noted Colgan went down over the marker.