Tropical cyclone Nargis made landfall in Myanmar (also known as Burma) on May 2, 2008. Since then, there have been quite a few map resources provided by both nongovernmental organizations and various government agencies to aid in assessment and rescue efforts. Below is a very brief list of a few online resources involved in providing mapping of the area:

Information Technology for Humanitarian Assistance, Cooperation and Action (ITHACA):
"A non-profit association, founded in November 2006 by the Politecnico of Torino and the Higher Institute on Innovation Territorial Systems (Si.T.I.). It operates on the Politecnico of Torino campus."

Center for Satellite Based Crisis Information (from the German Aerospace Center (DLR)):
Based on data of the RADAR satellites TerraSAR-X (DLR/Infoterra) and ALOS/PALSAR (JAXA), the Center for Satellite Based Crisis Information (ZKI) at DLR produces maps of the affected areas and supports the activities of the World Food Programme (WFP) and UN OCHA. Map production is carried out in the framework of the GMES Service Element RESPOND or is accomplished in collaboration with ITHACA.

United States Geological Survey (USGS):
The link above is to a Google Custom Site search for "Nargis" on the USGS site. The Survey has provided quite a bit of satellite imagery to aid rescue efforts and has collected weather related data from the satellite imagery as well.

Additionally, from the All Points Blog:
Respond, an alliance of European and other international organizations, has released maps, including digital data that is freely available for downloading, that were used for flood mitigation preparations before Cyclone Nargis. In addition, UNOSAT, a Respond partner, has produced maps related directly to floods as a result of Nargis.