Well, here's a way to make your research a bit easier - 50 Ways to Go Green at Your Wedding. This helpful article offers a list of 50 great resources, ranging from Green Wedding Guides to to Eco-Invitations.
Some of my favorites from the list:
#4 - Ecopolitan Bride: a website that offers eco-friendly and unique, non-traditional wedding ideas
#10 How to Reuse it Creatively: Great article for eco-weddings on a cool, crafty website! ( with lots of cool non-wedding DIY projects, too!)
#11 Recycled Bride: a cool wedding re-sale site
# 40 - Carbon Calculators: allows you to measure the carbon footprint of your wedding.
Check out the article for all 50 great tips!