So then how does cufon affect SEO? Well now that google has released “instant preview”, cufon font is not being rendered in the images. Some suggest it is a problem with google’s bot. Regardless, this is an issue for YOUR cufon website! Your image can come up completely incomplete in the preview pane.
I will use Katy Perry’s website as an example. Just look below at the highlighted sections that use Cufon and see how cufon is missing completely: