One of the problems with setting up how a web page looks is that the browser can only display the page content in a font that is actually installed on the local computer using just the facilities of CSS that are supported by all the commonly used browsers. There have been several different proprietary solutions to embedding fonts into a web page but each of those only works in the browser that defined that solution and using any of those solutions runs the risk of breaking the page completely in other browsers.
This solution has several problems of its own though and while it might work for all the major browsers, it will not work for everyone including a percentage of those using browsers where it can work.
As with the proprietary font embedding methods, this method runs the risk of breaking your web page for at least some of your potential visitors.
Oh, and if after all that you decide to still go ahead and use sIFR you should at least make sure you are using the latest version of the code.
This article written by Stephen Chapman, Felgall Pty Ltd.