What is the difference between ArcWeb Services and ArcGIS Online?
In many ways, ArcWeb Services and ArcGIS Online are similar: they share a common foundation and offer online GIS content and capabilities. The main distinction between the two is the target user: ArcWeb Services is suitable for the Web developer creating or integrating applications, whereas ArcGIS Online is geared toward the ArcGIS user who wants to enhance existing ArcGIS datasets with Web services. For more information about the differences, view a slide show at http://www.arcwebservices.com/v2006/demos/aws_ago/arcweb_arcgisonline_skin.swf.