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Originally Posted by metal68
If this is the case then who are 'we'?? Which one is the real us? And why are we experiencing the 'I' that we are?
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There's two ways of looking at it - they're all you, and they constitute a kind of hydra with infinite heads. Backwards, they all came into being at some point or another, and forwards, they all go die off after a time.
Alternatively, you're the only you, and they're all somebody else.
It gets amusing depending on how you choose to interpret the idea of infinity - do you assume that, out of infinite attempts, at least one of you has to be rendered immortal by some outlandish circumstance? Or are there an infinite number of universes where you cease to be? I don't see anything wrong with either interpretation, besides this being speculative to the point of science fiction.
An alternative to the presumption of many-states implied by quantum mechanics is that something is annihilating all of those possibilities, and that the universe, on a macroscopic scale, is pruned by this process into a single messy result. That pruning may well be related to, or a form of, the observer effect.