Wei Dai said
> On a different note, I'm trying to learn enough quantum mechanics to
> figure out what a program for our universe might look like. Does anyone
> have suggestions for a good quantum mechanics text book?
P.C.W. Davies, _Quantum mechanics_ is OK. Eisberg and Resnick wrote
a textbook which has been recommended to me. Dirac's _The principles
of quantum mechanics_ is the classic exposition of the full formalism.
_QED_ by Feynman is the best starting point for quantum field theory
and the sum over histories, I think. Franz Mandl's _Introduction to
Quantum Field Theory_ was useful when I was trying to learn the
subject. Veltman's _Diagrammatica_ has all the Feynman rules for
the standard model in an appendix.