sIFR3 is a combination of JavaScript and flash, which allows you to dynamically view text using flash. This can improve you website look dramatically, because you are sure that it will look the same in every browser and that its much smoother looking than basic HTML text. If you take a look at a <h2> title in IE6, you will notice the pixels and that its not very smooth looking. In IE7 they changed this, so all the text should look smooth and nice. But that's not anything near what sIFR3 can do for you. The image below will show the difference when sIFR3 is turned on and when its turned off.