Indigo Children? LOL! Saw that website some time ago, must admit it strikes a chord...
It's unbelievable how people assume that parallel evolution is possible. REALLY! There's a good chance that we've already encountered other intelligent life. However, there's an equally good chance that we wouldn't understand it even if we did. Dolphins are intelligent, and so are whales. For all we know half the clouds on Jupiter might be more intelligent than we are, but we have nothing in common with them, so communication would verge on the impossible. These are just some examples!
Honestly, the myth of the little green men (and other anthropomorphic horrors) is just that, a myth, most likely concocted to pull attention away from the real TRUTH, which is that they've already been here, and they LEFT. If you think about it, humanity doesn't have much to offer beings capable of interstellar travel.