AMC's Mohican Outdoor Center in the Kittatinny Mountains can be used as a base to XC ski.
For transportation see http://www.outdoors.org/lodging/mohican/mohican-directions.cfm
To make reservations see http://www.outdoors.org/lodging/mohican/
There are several good tours within a few miles, especially Blue Mountain Lakes which is a favorite. Remember, ski with a partner, please don't go out in the woods alone in winter.

