Why do only some of my system fonts work in my HTML?

Question

I have Din Engshrift and other obscure fonts installed on my machine where I do development. But when I try to access them from HTML, they look completely warped. Fonts like "Courier New" work fine. What causes that?

Answer 1

Using anything but standard-fonts is possibly only since very recently: http://www.tudy.ro/2008/09/02/embedded-web-fonts-are-back/.

It won't work in all browsers, though.

UPDATE:

This might be interesting, too: Typekit