Thanks for the site, Rob. :) I only wish I'd found it sooner.

I took an excellent Science Fiction literature class at the University of Nottingham (England) several years ago. I don't remember everything that we read, but I know that there were some truly mind-bending Phillip K. Dick short stories regarding time paradoxes. If you contact their English department, I'm sure the prof who taught the course could provide some good reading suggestions.