I was a little surprised that this wasn't in the list:
Chapter 1 in the book "The Mind Is Mightier Than The Sword" by Lama Surya Das deals with Natural Meditation. It's a little more in depth than the on-line article. You don't have to do anything. It's about intention and attention. It's present moment awareness.
And if you don't want to consider yourself a budding Buddha-to-be, then don't. I love the East meets West approach.