Below are links to directions for making your own self watering containers or Earthboxtm
A great source of information. Click on the instructions on the left side.
Wonderful step by step instructions for making your own gardening system
Very extensive instructions for making your self watering garden using various containers.
You can Google "Earthboxes" and see numerous sites with pictures of the final product and what has been grown.
Additional links
http://forums.gardenweb.com/forums/load/calif/msg0415511312427.html
http://www.treehugger.com/files/2005/06/earthbox_plante.php
http://www.instructables.com/id/Planting-an-Earth-Box/