Dear Sara,
Thanks for the detailed response! Regarding the possibility that life may be inherently quantum-mechanical, I expect at least that this is the case with consciousness. This is principally because of the need to escape determinism on self-referential grounds. In particular, I am not much a believer in classical digital strong AI.
With regard to the causal efficacy of information in fundamental physics, I realize now that I was probably using the word "information" in a different sense than you. What I was referring to was the prevalence in the field of quantum gravity of models involving a fundamental scale with irreducible, indistinguishable elements. The usual distinction between "information" and the physical system used to encode it is no longer clear at this level. Ordinarily, this distinction is justified by the fact that there are many different ways to encode information physically, with no particular method preferable to the others. At the fundamental scale, however, there is a unique "preferred" physical encoding of the "information" in a system: namely the system itself.
This is related to entropy; you've probably heard the example involving a deck of playing cards: you can associated an entropy to the deck ignoring everything except that there are 52 distinguishable objects. However, if you consider the thermodynamic entropy of all the molecules in the deck, it is vastly greater. Relating entropy to information, the point is that the existence of a fundamental scale would provide a bottom to this kind of consideration; you could associate a measure called THE entropy to any system. Mathematically, this is related to things like compression and Kolmogorov complexity. Maybe this justifies the "it-from-bit" view in a sense. Take care,
Ben