Global Permaculture Mailing List on UNC listserv. http://lists.ibiblio.org/mailman/listinfo/permaculture
The largest international list. Very broad range of topics. Years of archives. Many permaculture teachers / designers. Requires list manager approval.
918 members as of 11/02/09

List Guidelines:
(You don't have to have completed a permaculture design course to be a member but you'll get more out of it if you have.
1) Be respectful of others... there is an actual human being on the other end of those words you're reading.
2) Be enthusiastic, after all, most are here because they really do enjoy permaculture.
3) Avoid the usual.... politics, diet, and religion... as much as practical.
4) Be engaging.... Post, post, post...Aim for brevity. Offer input when you can and recognize when you can't.
5) Start a new thread instead of hijacking or dominating one that offends you.
6) Have fun! Permaculture IS fun, interesting, useful and enlightening.
The wonderful people here make it even more enjoyable.

Permaculture Forum at Permies.com: http://www.permies.com/permaculture-forums

This is about the busiest and most visited permaculture forum that I know of with the potential exception of some Australian sites.

permaculture, organic practices, critter care, general homesteading, alternative building, alternative energy, woodland care, cooking and food preservation, fungi, intentional community, wildcrafting, medicinal herbs, art, music and aesthetics, resources: seeds, plants, honey, consulting, etc., WWOOF / organic farm volunteers/interns/jobs...

WiserEarth
serves the people who are transforming the world. It is a community directory and networking forum that maps and connects non-governmental organizations and individuals addressing the central issues of our day: climate change, poverty, the environment, peace, water, hunger, social justice, conservation, human rights and more. Content is created and edited by people like you.
Here's a couple of the Permaculture groups there:
Permaculture Alliance of California, US based, international in scale. http://www.wiserearth.org/group/permaculture
Permaculture Association of Teachers and Organizers  http://www.wiserearth.org/group/PATO

South Coast Permaculture Guild and Santa Barbara Permaculture Network. To get Up to Date Permaculture Ongoing Announcements for courses , events and posting of articles of interest try subscribing to our local Permaculture Listserves. ccpg serves San Lois Obispo (ccpg@arashi.com), scpg serves Santa Barbara down and including Los Angeles (scpg@arashi,com), and sdpg serves San Diego area (sdpg@arashi.com).
TO SUBSCRIBE to this mailing listserve, log on at the appropriate regional website to which you wish to subscribe.

SoCal PCG subscription:   http://www.arashi.com/mailman/listinfo.cgi/scpg
SanDiego PCG subscription:   http://www.arashi.com/mailman/listinfo.cgi/sdpg
CentralCoast Cal PCG subscription   http://www.arashi.com/mailman/listinfo.cgi/ccpg

Contact: , South Coast Permaculture Guild and Santa Barbara Permaculture Network 224E Figueroa ST #C Santa Barbara CA 93101 

HopeDance magazine, which is very supportive of Permaculture's expansion, maintains two e-mail lists that enable its readers to easily communicate with each other. One list is for global discussions and the other for local discussions (i.e. pertaining to the Central Coast of California). Go to http://hopedance.org/component/user/register to sign up.

Northeastern Permaculture Network Wiki: The network is a group of designers, teachers, students, activists, farmers, homesteaders, and other permaculture enthusiasts who mutually support and collaborate to demonstrate, educate, and inspire permaculture solutions in the Northeast and New England.
http://northeasternpermaculture.wikispaces.com/

Bay Area California Permaculture email lists:
San Francisco: http://groups.yahoo.com/group/permaculture-sf/

East Bay: http://groups.yahoo.com/group/eastbaypermaculture/

Sonoma: http://groups.yahoo.com/group/SonomaCountyPermaculture/

Sierra Permaculture
http://groups.yahoo.com/group/SierraPermaculture
Sierra Permaculture is a new Listserve for up-to-date Permaculture and Relocalization happenings in the Sierra Nevada, CA bioregion including:

- PC course and workshop announcements
- Relocalization organizing and coordination
- Permaculture site tours
- Networking and fundraising events
- Related articles and reviews
- Links to PC-related websites, directories and information sources

Arizona Permaculture Group http://groups.yahoo.com/group/azpermaculture/  THE ARIZONA PERMACULTURE NETWORK is a loose affiliation of permaculture practitioners and others interested in the sustainability of Arizona. We are not an organization, but a network connected solely through this listserve.

THIS LISTSERVE was created to support communication, resource sharing, and relationship-building among folks interested in permaculture in Arizona and surrounding regions.

Appropedia is the site for collaborative solutions in sustainability, poverty reduction and international development. Appropedia helps us sustain our world. Learn more at our Mission page. Appropedia Blog.

Permaculture.info   The Permaculture Information Web is a collaborative project to provide a comprehensive resource of permaculture related information. This wiki uses a precise language to describe the different parts of human habitat and that language is used to categorize the articles in this wiki. This narrative identifies the categories and shows how they fit together. Follow links to start exploring the content.

PEOPLE - organizations | members

THINGS - elements | guilds | built structures | patterns

IDEAS - core concepts | environmental context | zones | techniques | tools | Peak Oil

RESOURCES - book reviews | public documents | online resources | design review | blogs | Discussion Groups | Permaculture Wikis

PLACES - all locations | ecoregions | permaculture sites | farming