There's an inquiry on the Muninet email group (mostly town clerks) asking about domestic partnership in Vermont. The Department of Human Resources has forms for it on its website, but the phone number listed on the form reportedly is out of service.
The forms are here: http://humanresources.vermont.gov/sites/dhr/files/Documents/Benefits/DHR-Domestic_Partner_App%26Policy.pdf
I will pass on any information you have to Muninet.
Mary Jane Grace
86 South Main St.
Waterbury VT 05676