As far as I know, the permaculture forum at the Permaculture Research Institute of Australia is the most active permaculture forum on the web. I know that it is a great place to post questions, look for connections, and find courses and job opportunities related to permaculture. To get there, go to this link:
http://forums.permaculture.org.au/
Have fun!
You'll find questions that relate to International Permaculture, Permaculture Thailand, SE Asian permaculture, tropical permaculture, permaculture jobs, organic farms, sustainable living, alternative energy, internships, permaculture course, PDC, and much more. Have a glance and find what you are after.
