When a disaster strikes and emergency responders head there to help, they need access to information. Since so much literature is now available online, publishers often generously offer temporary free access to those whose normal sources are unavailable due to destruction of infrastructure and to emergency responders in the hard-hit area.
The Emergency Access Initiative (EAI http://eai.nlm.nih.gov/) managed by the National Library of Medicine is a central point for this project. During the Haiti earthquake the initiative was active for 8 weeks, and it has just closed.
NLM's Disaster Information Management Research Center continues to offer a variety of valuable disaster-related links http://sis.nlm.nih.gov/dimrc.html