You guys have been scattered throughout this entire thread. There has been no coherent direction, unfortunately. Jumping from an all-knowing HAL/Skynet-like computer race reproducing on its own to take over the universe, to a nano-based parasitic Borg race, to human's in entirely artificial bodies. Apologies if I can't follow. Jokes aside, this is one of my favourite things to discuss (to myself

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How typical for alpha to preface every post with a bit of whining.
My original view is not one of a man vs machine, super-intelligent AI problem. I side with Key and Twist in that AI cannot possibly become sentient beings, regardless if this is the intended outcome of programmers. Even with fast approaching quantum computing technologies, AI will simply be fast and complex calculators. Now, when we do get to android levels of intelligence, perhaps then will 'sentience' be reexamined and redefined. As it is for now, I don't see it occurring.
The idea is that the human brain will be reversed engineered by around 2020 and then we'd be able to bestow upon the machines our level of intelligence and then they'd be able to pass the turing test. There is really no scientific way of proving that something is conscious, so if a machine is able to talk and act like a human so much so that a human would be unable to distinguish between human and machine (which is what the turning test examines) then for all intents and purposes that machine should be considered conscious. We already have AI that is "fast and complex calculators", computers of today can memorize trillions of things instantaneously and they're already being used in many industries, the next step is to have a machine pass the turing test.
How I view singularity is once again the moment when the barrier between human and machine is no longer distinguishable. Yes, in the simplest terms singularity refers to computer intelligence meeting human intelligence, whatever "intelligence" is. But long before that occurs, humanity and machine will already have been irreversibly intertwined. It will, as it already has, start in the field of medicine. Beginning with bionanotechnologies, humans will be (are) using machines to rid the world of diseases, from within the natural body. Nano and quantum tech will allow for possibilities only currently imaginable in science fiction; rapid regeneration of tissue and organs entirely, disease combatant bodies, dramatically improved sensory and physical capabilities, improved intelligence, improved mechanisms of dreaming, losing the need for daily sleep, dramatically improved metabolism (no more purging of excess vitamins, proteins, etc), cancer-attacking capabilities, and so much more.
That's right, the process has already started and the singularity will just be the icing on the cake.
All that as a result of computer intelligence laced within the bodies of humans. But it will go further than this. Some will advocate that technologies have more to offer than natural bodies, unfortunately for them,
entirely technological bodies will never have the sensory capabilities of their human counterparts. Technology will only compliment the natural. So this will lead people to advocate for upgrading, saying it is a right of all and no one should be left behind. Thus, a split down the center of humanity. It will start between the masses snickering at the rich as "trying to live forever", but as this becomes common day practice over the decades, it will not be about rich vs poor. This will be an ideological divide unlike religion.
That's not true that tech bodies will not have as much sensory capabilities of biological bodies. People will upgrade to tech bodies to enhance themselves, not to diminish their capabilities. True, the robots of today do not have sensory capability, but taking into account Moore's law and the rapid progression of technology, that will obviously change in the near future. As a matter of fact, I just read an article about a researchers working to give robots the sense of touch.
Before humanity is even able to face the threat of an all-knowing robot race, it will face itself. However, it may be likely that the progression toward the above will occur in a mundane and everyday fashion, that it will go unnoticed, by most.