http://skivermont.com/nordic-reciprocalBasically, you buy a pass at almost any nordic resort in VT and it comes with a complimentary day for the other resorts.
I'd imagine you could game the system OR EVEN BETTER support a resort that you like and have a sweet couple of vacations. It sucks that NY doesn't have a program like this. Or that alpine resorts couldn't work together more to do super-passes on the EC, but that's another story.