Take a look at this A List Apart article. The pertinent CSS is:
@font-face {
font-family: "Kimberley";
src: url(http://www.princexml.com/fonts/larabie/kimberle.ttf) format("truetype");
}
h1 { font-family: "Kimberley", sans-serif }
The above will work in Chrome/Safari/FireFox. As Paul D. Waite pointed out in the comments you can get it to work with IE if you convert the font to the EOT format.
The good news is that this seems to degrade gracefully in older browsers, so as long as you're aware and comfortable with the fact that not all users will see the same font, it's safe to use.