Biblical Families
The Patriarchs Journal, is a free, mailed periodical that you will want to to subscribe to - published by a friend of Biblical Families, Clyde Pilkington, Jr. You'll find his blog here too, as well as the Patriarchal Publishing House bookstore.
If you don't get the Biblical Families email newsletter, you can sign up at the bottom of any page, and read past newsletters here.
One of the most important early polygamy websites, Sam Chapman's venerable UK-based PolygamyPage, is still online here, though not updated anymore. It was critical to many of us in the late 90s.
A good Biblical overview of polygamy by a Pastor - who has nothing to do with the plural marriage movement, but simply recognized the truth.
You'll find many other useful links have been posted by members in our Links of Interest forum.