When checking the comments and spam in my wordpress administrator I saw that WordPress got an update a few hours ago. The new 2.0.4 release contains several important security updates, so you are strongly advised to upgrade. In addition to the security enhancements, there are many other small bug fixes, as well.

I first upgraded a test/development site to check the upgrade procedure was working and then went forward and upgraded my production blog. It was very painless, I hope it is the same for you.