Some articles that may interest some. Referenced from a recent article in New Scientist. Subscription is required to read the New Scientist online, but the articles themselves are available on arxiv:

The Computational universe: Quantum gravity from quantum computation. Seth Lloyd (MIT, LNS) . Jan 2005. 31pp. Submitted to Science

Quantum gravity computers: On the Theory of computation with indefinite causal structure. Lucien Hardy (Perimeter Inst. Theor. Phys.) . Jan 2007. 24pp. To appear in the proceedings of Quantum Reality, Relativistic Causality, and Closing the Epistemic Circle: An International Conference in Honor of Abner Shimony, Waterloo, Ontario, Canada, 18-21 Jul 2006.