Using a generator script located here you may upload your .ttf or .otf font (if you don't own the license to the font you shouldn't upload it).  The generator saves the result as an SVG font and then converts the paths to VML which is supported natively in IE browsers. The resulting document is converted into JSON and functional javascript. 

So, to include a font in a web page you need only to save the generated .js script, upload it to your site, and then load it with the usual <script> tag like any other javascript.  The external javascript blocks execution until the files have loaded which prevents flickering on font replacement and the compressed files are easily 60% to 80% smaller in byte size than the original.

Cufon fonts available at time of writing displayed below. These are all free fonts with no copyright restrictions that I'm aware of other than appropriate credits to the creators.

The following are from the Larabie collection

Coolvetica

Credit