Following up on the last post about the NYS Orthoimagery WMS Mapping layer, there are more and more layers available. See this site:
[www.skylab-mobilesystems.com] If you see a WMS layer of interest, Right-click the name in Internet Explorer and choose "Copy Shortcut". Then go into ArcCatalog and create a new WMS Mapping Service. (See instructions previous post). Enter the URL of the WMS you want in the dialog box, and add your service!