= Embeddable web fonts =

 * http://www.sanskritweb.net/forgers/publicdomain2.pdf
 * http://webfonts.info/wiki/index.php?title=%40font-face_browser_support
 * http://robert.accettura.com/blog/2009/07/03/optimizing-font-face-for-performance/
 * http://en.wikipedia.org/wiki/DIN_1451
 * http://www.linotypelibrary.com/13205/din1451mittelschrift-font.html
 * http://www.fontsquirrel.com/fontface/generator
 * http://automatsvet.cz/traffic/
 * http://opendesktop.org/content/show.php?content=107153

DIN 1451 is apparently in the public domain now, according to the first link; at least the design itself is. Any digitisations thereof may or may not be, however.