The Power. Of Now.
Mindfulness is a simple and direct tool: it is being aware of the exact moment and fully accepting it and living in it–not allowing your attention to be anywhere but right here, right now. It sounds and is simple, but it’s something that takes practice to fully understand and consistently apply. The Power of Now is a good presentation of these concepts, it breaks them down in an understandable and simple manner. Eckert Tolle is particularly skilled at slipping these concepts past your mind and into your conscious.
Sadly, the book is written from a ‘spiritual’ perspective, so the solid concepts are presented along with lots of spiritual nonsense. This is not a problem for anyone who knows not to take things personally and can extract useful from not useful information. Unfortunately, many appear not to have this ability. It is not surprising that a book that has killing the ego as a major theme, has caused many (what appear to be) ego-centric out-lashes against it. If you’re secure in your knowledge of reality, seeing them contradicted should not fill you with emotion.
I do not toss and turn wondering if science is wrong and we’re all just energy. Since I’m confident in the objectiveness of reality and mathematical science as the sole source of truth, it does not bother me to brush aside the serving of mumbo jumbo that came with my meal of useful information.
If you’re weak minded and pathetic however, it may bother you. (Relax! I’m kidding–my cup of tea may be your cup of turpentine.) If you can’t stand listening to woe, there are other books such as Mindsight that present mindfulness from a more grounded perspective.