Watched "Terminator 4" today and I decided to do a little "Googling" on the series. I came across this incredible site filled with detailed information on the world before and after "Judgement Day". If you are up to a little reading, check it out.
"This website represents an original, thought provoking and continuing extrapolation of James Cameron's ground breaking work. Materials and information found on this website are based on concepts and ideas that were first presented by James Cameron in his 1984 movie "The Terminator", the 1991 follow-up sequel "Terminator 2: Judgment Day" as well as the two novelizations of those movies. This site has been, is currently and will continue to be a work in progress attempting to pay homage to the incredible death dealing technology presented in Cameron's unique dark vision of the near future."