I'm loving Opening Up and Tristan Taormino's website is great. She links to the following resource as well.
Peppermint's Freaksexual. I love this site. Really insightful essays about issues within the poly community and the communities that intersect with it.
Older essays of his are at essays by peppermint.
Two others I enjoy are Not Your Mother's Playground and Young Metro Poly.
Are you a polyamorist or non-monogamous individual between the ages 18-35? Are you located in New York State or the Northeast?
Join us at The Network, a social and socially aware network which connects young polys and progressive polys of all ages.
~Open up your mind and let me step inside.
Rest your weary head and let your heart decide. It's so easy.
When you know the rules.
It's so easy. All you have to do is fall in love.
Play the game.
Everybody play the game of love. Yeah...~