GIS Gives Port a Common Operating Picture
San Diego Port Authority
ArcUser, Winter 2010
ArcGIS Online—free and subscription-based maps, layers, tools, and services
ArcGIS for Server—to publish your own data and maps
After you download the free ArcGIS for AutoCAD application, the ArcGIS for AutoCAD ribbon tab will be added to the AutoCAD session after the application is loaded. Various standard AutoCAD interfaces will be extended to work with GIS data in AutoCAD including the entity Properties panel.

A sample of the new ribbon tab.
ArcGIS for AutoCAD provides a complete Help system that includes an installation guide, quick tour, how-to topics, and a customization section for developers.