FYI, ComputerWorld is running an interesting interview with Theo de Raadt, on the state of software security, and OpenBSD in particular. See http://www.computerworld.com.au/index.php/id;1498222899;fp;16;fpid;0 for the complete text.
You can find his presentation on exploit mitigation techniques that was mentioned in the article at http://cvs.openbsd.org/papers/auug04/index.html
-- James Walden, Ph.D. Visiting Assistant Professor of EECS The University of Toledo @ LCCC http://www.eecs.utoledo.edu/~jwalden/