OpenStreetMap adds an export feature that, as you might expect, goes beyond embedding a map on your site:

Want a static map for your blog, without having to spend hours fiddling with JavaScript? No problem - just export in PNG or JPEG. Want a map for a book? PDF or SVG are the perfect formats — fully vectorised, so they look smooth on high-resolution printers at any scale, and are easy to restyle or edit. Want to play with the raw data? Get it in our easy-to-parse OpenStreetMap XML format.