Scubadiverlife published recently a very interesting article about the worst habits in scuba diving. This is a very important read no matter how novice or experienced diver you are.
The author of the article is Thomas Gronfeldt. Thomas started diving during college and has since been diving over most of the world: Australia, Indonesia, Iceland, France, and many other places. He is a NAUI instructor and a commercial diver, and participates in environmental and archeological diving projects around the world.