My own site: http://sandradodd.com
Pam Laricchia's: http://www.livingjoyfully.ca
Pam Sorooshian's blog (linking to my favorite post there): http://learninghappens.wordpress.com/2011/09/24/unschooling-is-not-child-led-learning/
Just Add Light and Stir (subscribe to get it each morning by e-mail): http://justaddlightandstir.blogspot.com
Unschooling Site News (news of SandraDodd.com): http://aboutunschooling.blogspot.com
Links to mainstream articles on unschooling and related topics, mostly. http://unschooling.blogspot.com
Always Learning discussion list: http://sandradodd.com/lists/alwayslearning.html
That leads to a page about the discussion, with a link to the joining page at the bottom.
A facebook group where lots of Always Learning regulars post: Radical Unschooling Info http://www.facebook.com/groups/303347574750/
Joyce mentioned this in her talk:Radical Unschoolers Network
This has subgroups, such as Canadian Radical Unschoolers (the CRU!) and other regional or special interest groups.