Some interesting sites shown above
I enjoy listening to the following (nearly daily) podcasts, though do have to make allowances for the fact he is doing it from the US.:
http://www.thesurvivalpodcast.com
For general survival ( going back to the 3rd world environment ) there is a lot of good stuff at
http://practicalaction.org/practicalanswers/ (look at their info on water purification & cooking )
http://www.instructables.com - A lot of hand tips and ways of doing things ie hydroponics