Here are links to all the articles in the "Terrain Modeling with ArcView GIS"
series that ran in ArcUser magazine along with links to the sample data sets,
online data sources, and data conversion utilities mentioned in these articles.
An ArcView GIS extension for converting SDTS DEM data to ArcView GIS grid data
has been developed by Dr. David G. Tarboton of Utah State University.
It is available from his Web site.