http://www.inhabitat.com/2008/05/07/rainpod-water-collection-system/
The Rainpod stands a bit taller than a person on three legs sourced from local timber. Its vaulted stature gives it enough gravitational draw and reach for just about any watering application, while an expandable screen maximizes its rain collecting radius. Its simplicity and ease of deployment would make it a great garden addition, and with a proper treatment system it could be used for applications where potable water is needed.