TerraServer Download for ArcGIS 8.x
http://arcscripts.esri.com/details.asp?dbid=12463

Thomas Emge, ESRI


This site from ESRI features a tool that provides access to the USGS data repository of public domain data and allows the user to integrate this raster information into ArcMap.
Essentially it provides access to imagery anywhere in the US. The source code is included.

This resource is referenced here:
Subject: Geography:Geospatial
Resource Type: Datasets and Tools:Tools
Special Interest: GIS