I read about the new version of the digital elevation model at 30 meters (SRTM 30 meters), but I can not find from were I can download it.
some sources:
http://glcfapp.glcf.umd.edu:8080/esdi/index.jsp
http://asterweb.jpl.nasa.gov/data.asp
http://www2.jpl.nasa.gov/srtm/