This vector design images of Free Vector Map of USA with State Names, in Adobe Illustrator and PDF can also be useful.
Zappos, the online shoes retailer, has produced a real-time map of orders placed on the Zappos website, from all over the United States. The orders are mapped to the location the order is being shipped to, in real-time.
Zappos uses photographs of the product being brought as the map marker. If you click on the photograph then you are taken to the web page for that product (and Zappos presumably hope you will be tempted to buy the product yourself).
This is a great way for Zappos to market their products and, judging by the comments on Twitter, quite a successful marketing tool as well.