Two sites worth a visit:

1. The Center for National Operations (cnosrilanka.org) in Sri Lanka is a powerful database-driven site maintained created by a private group of individuals, and now run by the Presidential Secretariat.

It covers many aspects of disaster operations in the country such as Water and Sanitation, Childcare, Logistics. Even an UN desk, and useful links. See this map of affected areas.

2. MapAction (http://www.mapaction.org) a UK-based international charity that assists in mapping of disaster areas. It uses satellite imagery, GIS and GPS. Want to see affected areas in Hambantota, or Galle? Check here.