I highly recommend adding sIFR to your web site, if it is appropriate. I have to admit for a long time I didn’t like it. But, sometimes adding nice looking typography to your site can really make it pop in a way that you can only do with Flash or images. So, the more I use sIFR, the more I like it, and the more I use it, the more I understand how it works. If you don’t know what sIFR is or what it does, please check out Mike Davidson’s sIFR site.
When you have sIFR installed on your site, sometimes you tend to notice the unstyled underlying text show up briefly before being replaced by Flash. If you have this problem, you will want to eliminate it to get the best user experience possible. It has a kind of jarring effect when you see the font change suddenly like that, so it is best to avoid it.
However, you may want to modify the code if you are only replacing a certain group of headlines, and not all of them at once. You can do this by adding an id to your headers and then adding the id to the header style in your sIFR stylesheet.