WordPress has annouced updates for both 2.1 and 2.0 series.
These releases include fixes for several publicly known minor XSS issues, one major XML-RPC issue, and a proactive full sweep of the WordPress codebase to protect against future problems. Many thanks to Sumit Siddharth and Alex Concha for their help with reporting issues in this release.
These include security updates so you should update soon. They are also monitoring the files closely so they do not have a repeat of the break in they had not long ago.
While it can be annoying to have so many updates and security fixes, it is great that they provide such a fantastic platform to blog on at no cost.