I've skied Killington for a few years now and discovered some decent back country there. There are some decent spots which I have found, among them a few drops in from juggernaut, as well as between the Snowden and Snowshed lodges. These all prove fun, however I have never found anything to compare with Jay or Sugarbush backcountry. Where is it at at the K?
http://www.killington.com/winter/mountain/trail_map/itm/map.html < check those spots on the map