Inline maps are great for a website. Especially if they show the location of your business or give directions on how to get there.
You can add maps and itinieraries to your site for free. From the main page, generate the map you want. Then on the right you will see a INSERT MAP ON SITE link. Very handy for generic travel and travel biased sites.
A huge collection of mainly copyright free maps made available by the library of congress. Please read the copyright information carefully before using any maps.
Topographical US maps that you can embed in your site. Up to 100 images on your site.