International Committee of the Red Cross (ICRC) has launched a South Asia Earthquake website to help people exchange information about family members in the disaster zone:

Direct link: http://www.familylinks.icrc.org/epi

Main site: http://www.icrc.org/home.nsf/home/webfamilylinks

Tom Vincent has set up a "simple page so people can leave messages and contact information, and search the messages for friends and family".

http://earthquake.t-worlds.com/