ArcGIS Desktop is the primary platform for GIS professionals to compile, use, and manage geographic information. It's the starting point and foundation for deploying GIS across your organization and onto the Web.
Learn more about Using ArcGIS Desktop
Access the ESRI basemaps for ArcGIS Desktop 9.3 or 9.3.1
Learn more about What's new in ArcGIS Desktop 9.3 or 9.3.1