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A Non-Perburtive Modification to M-Theory
Site gives complete history and reference of a Non-Perturbitive Modification to M-Theory in Ebook format
http://www.theory.mybravenet.com
M-Theory
Site discusses String theory, M-Theory, Gravity, and Modification to M-Theory
http://www.superstringtheory.fanspace.com
QGravity.Org
An simple overview of current theories of quantum gravity.
http://www.qgravity.org/
The Official Superstring Theory Web Site
A comprehensive site of information for non-scientists with an interest in superstring theory.
http://superstringtheory.com/