Have you upgraded to Worpress 2.2 yet? If not then your blog is exposed to potentially dangerous security risks.
Hundreds of thousands of blogs use Wordpress, yet as I write this blog post Worpress 2.2 had only been downloaded about 92,200 times. That means there are a ton of exposed blogs out there!
Download Wordpress 2.2 here, and while you're at the site sign up for their notification mailing list (at the bottom of the download page) to make sure you know when a new version is available.
Also, Wordpress 2.3 is currently scheduled for release on August 20, 2007, and 2.4 is scheduled for November 26, 2007. So you could put a reminder on your calendar to check for updates on those dates.