I do not agree that the way to enlightenment is to observe the ego or to negate the ego (I think what is meant by ego here = mind =left brain functioning). Without our ability to think and analyze, we'd be dysfunctional. We were given left brain functioning to make sense of things; the ego is not "bad" or the root of evil. Rather than obsessing over the ego and trying to "let go of it," (yeah, right) let's use it to question our most cherished beliefs and put together the bigger picture using both our left-brain and right-brain (soul, intuition, heart) functions. You need a balance here, not a negation.
There is a bigger picture about why things are the way they are on earth but Tolle does not see it. Your soul has a bigger plan for your life. You will need to look deeper than the ego to see it, you will need to pay attention to the guidance of your soul (your intuition), but also you cannot negate your ego or let go of it because you will need to use it to form this bigger picture understanding. Once you do this though, instead of blaming the ego you will begin to understand why your life is the way it is and that even your biggest issues are based on your deep Love for people, life, and even the self. Go deep enough and you will find this Love.
For anyone tired of blaming the ego, for anyone wanting an understanding of life that's based on love, where the foundation and reason for life is Love and passion, where there's something more than the "this too will pass" "pain-body" attitude, I would recommend "Courageous Souls: Do we plan our life challenges before birth?" by Robert Schwartz. Schwartz's excellent book explains why we might have WANTED to experience hardships in life. I would also recommend my own book, "What Everyone Believed: A Memoir of Intuition and Awakening," which shows and explains the entire picture and the beautiful and exalted reasons for why we jumped at the chance to experience life here. It shows the divine reasons for our sojourn into "duality," as well as the way beyond it, so that so that we can now begin experiencing new possibilities consistent with the "Golden Age"-our extraordinary destiny. We will have to do some work and let go of some of our beliefs, of course, but not our ego.--Christine Hoeflich, author of "What Everyone Believed: A Memoir of Intuition and Awakening"