[UPDATED May 9th: Google and other organizations have released many Myanmar visualizations for Google Earth including storm tracks, flooding data, and before/after satellite imagery. This post is being updated with the latest.]
Over the weekend, Tropical Cyclone Nargis struck Myanmar as a category 4 storm with winds greater than 115 knots. The storms caused terrible flooding as well, and thousands of lives were lost. The UN Institute for Training and Research Operational Satellite Applications Programme (UNOSAT) regularly creates maps to track disaster situations and has released a visualization for Google Earth 
showing the track and strength of the storm and the extent of flooding which resulted. via Google LatLong Blog.
Also, here are a couple of NASA satellite photos of the storm before it struck and as it was over Myanmar . via GEarthHacks and NASA.
Google provided a new KML showing an animation of Cyclone Nargis from the Naval Research Laboratory’s satellite imagery. You have to wait for each set of images to load (it takes a minute or two) before the animation plays smoothly. Also, adjust the animation speed for smoother playback (click on the clock icon on the left of the time slider). Google also linked to an NRL KML which shows more details during the timeline of the hurricane. via Google LatLong Blog.
HurricaneMapping.com sent me a Nargis KML which shows the track of the storm along with wind swaths, and details at various stages of the path.
Google has posted a new KML file which shows a variety of before and after Cyclone Nargis imagery of Myanmar. The imagery comes from a variety of sources including NASA, DigitalGlobe, and GeoEye/CRISP Singapore. You can clearly see the tremendous flooding which has caused the worst of the damage and fatalities from this storm.
As an aid to workers in Myanmar, Direct Relief International has released this KML file showing all of the Myanmar Ministry of Health facilities (over 700 sites) using data from the WHO 2002 Global Health Atlas survey. They used the spreadsheet mapper tool to make the collection.
This thread contains data in Google Earth Format for the area affected by Cylone NARGIS in Myanmar (Burma).
The data presented here is not meant to be replace any official source. Please use the data below for review purposes only. Please be aware that the data presented below will not be up-dated and considerable effort is now underway to improve the accuracy of the data sets available. Users that require the most accurate data should refer directly to the appropriate international relief agencies (UN OCHA, WFP etc).
A lot of the data in this thread is derived from VMAP Level One GIS data for the area affected by Cyclone Nargis converted to ESRI Arcview format and then to kml. As far as I am aware this may be the best available GIS data for the affected area. This data was originally released by my old agency USGS for the Tsunami. Please forward the links to the data to whoever else needs it.
A link to retrieve the ESRI shapefiles for the VMAP Level 1 tile. THe link will expire in May 22 2008 and will be available for 500 number of downloads. Link: http://www.yousendit.com/download/TDJieW56QzdvQnMwTVE9PQ
Regards,
Landmine Mapper