My Plastic-free Life (Beth Terry, an authority on going plastic-free)
The Story of Stuff Project’s The Story of Plastic
Plastic Free July (efforts can be applied year-round!)
Algalita, founded by Captain Charles Moore
Bea Johnson @ Zero Waste Home
Kathryn @ Going Zero Waste
Catalog Choice (to stop junk mail)
Jeff Corwin has many shows, several books, and is featured in a lot of online content. Follow him on his facebook page to see his newest adventures and missions. I reviewed one of his books and you can read it here.
The Whale Sanctuary Project is working to establish a model seaside sanctuary where captive cetaceans (whales and dolphins) can be rehabilitated and live in their natural habitat.
GreenEcoWarriors.org: Their mission is “Creating a Culture of Sustainable thinkers” through education aligned with national standards. I learned about this organization from reading Pesky Plastic: An Environmental Story by the founder and CEO of GreenEcoWarriors.