Played 
Today I finally got around to implementing Typekit on digitalformula.net. It's something I've been meaning to do for ages but because of other commitments I just haven't had time.
Anyway, I use ExpressionEngine to publish this site and a local build of Debian Linux to develop the site with. Because I have a 'Portfolio' account on Typekit it means I can have unlimited sites, unlimited fonts per kit and access to the entire font library. I tried cufón a while ago but had mixed results whereas Typekit kinda just works. Yes, yes, cufón is great but personally I prefer Typekit. :-)
Because of the two build environments it means that the Portfolio license can be used to create two different kits and that means telling ExpressionEngine which kit to load. I have the following code in the <head></head> section of this site and it works perfectly.
<?php
if (strpos($_SERVER["SERVER_NAME"], "local"))
{
?>
<?php
}
else
{
?>
<?php
}
?>
Just replace [dev kit code] and [live kit code] with your own codes and you're good to go. Super simple and super effective.