How It Works
The first step is to submit your font through the Cufon website. They process the font into an SVG(scalable vector graphics) font. Then the paths are acquired processed to VML(vector markup language), which greatly increases the speed of Cufon in IE. The resulting data is then encoded into JSON and passed to a Cufon defined function for processing, and that’s where the magic happens.
First up, go to the Cufon website, and submit your font file for processing. It will spit out a .js file for you to download. You have to have this file in order for Cufon to translate the text into the font of your choice.
This is text in the Molot font
There is a known problem with all browsers with line height that is probably not going to be fixed
It is recommended that for a better viewing experience on IE that you call the function Cufon.now() right before the body tag. This takes care of an otherwise momentary blip that may happen as the page loads and then the font is loaded.
<script> Cufon.now() </script> </body> </html>
As of this posting, there were some problems with certain versions of IE9, I know that they were working on resolving them and hope to have a release out soon to fix these issues.