The website for the Green Party of the United States has an active discussion forum for Greens across the country. Many issues related to the 10 key values are discussed here. The various Green Party caucuses are also represented.
There are also many people posting notes building the party, about recent events and also about skills they can offer the Green Party.
You can find out more here: https://secure.gpus.org/secure/GreenPartyForum/index.php
The main site address is gp.org