If you installed Wordpress 2.1.1 you may be at risk for an exploit, according to Matt Mullenweg:
Long story short: If you downloaded WordPress 2.1.1 within the past 3-4 days, your files may include a security exploit that was added by a cracker, and you should upgrade all of your files to 2.1.2 immediately.
I upgraded my installation last night with exactly zero hiccups by following the instructions here.
I will blog more about Wordpress in the future, I am sure. It is the best platform I have used, and I love the variety of themes, plugins and widgets made available by the community.
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