Hi,
This is an archive of Ecotect educational resources, which is not offered by Autodesk anymore:
http://wiki.naturalfrequency.com/
If you want to go directly to Ecotect tutorials, use the following links:
http://wiki.naturalfrequency.com/archive/ecotect/tutorials/tutorials.htm
http://wiki.naturalfrequency.com/wiki/Ecotect_Tutorials
Enjoy,