If you use WordPress, be sure to keep your version up to date.

The folks at WordPress recently emphasized this in a blog post: http://wordpress.org/development/2009/09/keep-wordpress-secure/

WordPress included an automatic upgrade feature inside the WordPress admin. Just go to Tools — Upgrade to make sure your WordPress version is up to date.

You’ll also see a message at the top of your WordPress admin panel asking you to upgrade when new versions are released.