I don't do nearly enough, but here are some of the things we do at our home:

recycle
use reusable shopping bags
very little chemicals for cleaning (i use almost exclusively vinegar, baking soda, and lemon juice for cleaning)
non toxic, environmentally friendly detergents and soaps for laundry and dishes
unplug stuff when not in use
one of our two cars is a hybrid

I'm getting a book called "green baby" for ideas on saving resources and using less chemicals for when our baby arrives...one thing I have read from several sources refers to cleaning baby using the "top and tail" method. Not really fully bathing baby in a bath until he starts crawling. Just cleaning the parts that need cleaning. I didn't read too far into it, but I think it was just with a warm wash cloth.