Just when everyone thought I was done blabbering about images generated by PHP, here we go again 
This time, Javascript automatically runs H1s and H2s through a script to generate headers with wacky fonts. Very l33t, very l33t. All your base are belong to us 
Scalable Inline Image Replacement – Inline Image Replacement Technique
The SIIR program serves to basically change dynamic text on your website into pretty generated images with any font of your liking. The real magic of SIIR comes when you examine the XHTML source of this page. Those beautiful headings you see generated above are not pre-made images. They’re merely <H1> and <H2> tags with text inside!
