I’ve just finished successfully updating my rel=author tags on this blog (many thanks to Yoast’s WordPress Author Tags article).
If anyone has a WordPress blog (or contributes to any other blog for that matter) I suggest you follow Yoast’s steps and implement author tags on your own blog. It not only looks great and increases click through rates in the SERPs, but it greatly improves your overall author credibility.
Update: Google is now allowing you to add the tag through a <link> element in the head of your site. More information can be found here.