"You might have noticed that the service release of WordPress 2.0.3 is now available for download. I do recommend to users that they perform this upgrade if they are using the 2.0 branch, because it addresses at least one security issue.

One security-related issue that you might be interested in is the new nonce system. It started with this thread on the WordPress hackers mailing list and became one of the most involved and complex discussions we’ve ever had. I personally had all too much to say about it. So what is a nonce and how does it affect you?"