Corrugated roofing made from soda bottles rocks! The ridge of our greenhouse leeks, I think I might make a ridge cap this way and see how it works.
Ecoideas.net has a variety of ideas using the concept of weaving plastic bottles.
How to make a broom out of 6 bottles.
Coca Cola came out with this set of tools that can be used with soda bottles. Lets see if its a gimmick or if it even makes it to the US market.