Did you install WordPress 2.1.1 in the past few days? You’ll want to upgrade ASAP:
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.
According to the folks at WordPress, some miscreant actually gained access to their download servers and inserted malicious code into the latest version of WordPress.
