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A water company in Portugal is planting a tree for every bottle sold. In addition, they collaborated with designers to create an alternative use: a bird house!
Reusable Water Bottle Tracks How Much Plastic You Keep Out of the Trash : TreeHugger. The 999Bottle is the work of Fernd van Engelen at Artefact. It's a smart, simple way to make the impact of a reusable water bottle more tangible; putting a number on it makes it more of an accomplishment. To take things further, van Engelen created an iPhone app to convert your number into things like how much oil you've saved.
Interesting water heater, but sure I could build it
Simple Cutter Gives Glass Bottles New Life : TreeHugger