How does Google view font replacement?

How does Google view font replacement (ie. Cufon, SIFR, FLIR)? Are some methods better than others, are all good, all bad? Flemming, Denmark Google Web Fonts: www.google.com Have a question? Ask it in our Webmaster Help Forum: productforums.google.com Want your question to be answered on a video like this? Follow us on Twitter and look for an announcement when we take new questions: twitter.com More videos: www.youtube.com Webmaster Central Blog: googlewebmastercentral.blogspot.com Webmaster Central: www.google.com