Google Maps is one of the best methods to track Swine Flu. It gets updated quite frequently. Purple marker is confirmed or probable, Pink marker is suspect, Yellow marker is negative, Fatal cases have no dot.
You can save the above Google maps of Swine flu as KML and then watch it on Google Earth. Visit this forum for the instructions.
Health Map is quite similar to Google Maps but gives you latest alerts, health index level etc. Visit the map for Swine Flu on Health Map.