References

Bryan Newbold, bnewbold@mit.edu
http://web.mit.edu/bnewbold/thesis/references.html

The SICM text book is free online; so is the SICP book.
There is an unofficial SICM mailing list.

Todo Quick Reading
http://en.wikipedia.org/wiki/Newman-Penrose_formalism
http://en.wikipedia.org/wiki/Cartan_connection_applications
http://en.wikipedia.org/wiki/Geodesics_as_Hamiltonian_flows
http://en.wikipedia.org/wiki/Noether%27s_theorem (field theory version)
http://en.wikipedia.org/wiki/Laplace-Runge-Lenz_vector (SICM?)
http://en.wikipedia.org/wiki/Numerical_relativity ("for culture")

Possible/Misc
The Confrontation between General Relativity and Experiment, will clifford

Computational GR
Try this google search? Other (download)