This is a very simple example using only one data layer, a vector file. You can download the datafile yourself from the USGS National Atlas. The URL for this layer, the US States Boundaries in Shapefile format, is http://edcftp.cr.usgs.gov/pub/data/nationalatlas/statesp020.tar.gz.
This example also draws some unprojected, static text. You can use this technique to label your maps: apply titles, timestamps, or copyright information.