Hang my clothes out to dry
Wash laundry in cold water
Use CFL light bulbs
Use sleep mode on the computers
Open the dishwasher after washing to air dry dishes
Use cloth bags for groceries (when I remember them, I'm getting better)
Shop second hand. I love thrift stores, dumps, and yard sales. We call our local dump the "Canal Flats Wal-mart" because most of the neighbors recycle things they find there.
To mark Earth Day, I am going to pick up the appalling litter I am finding by the trail I walk the dog on.