In case you haven't heard, an out-of-band security update was released today for Internet Explorer 7.
What Does This Mean?
"Out-of-band" means that this release was important enough to be released outside of the normal monthly update cycle.
Why is This Update Important?
The update is marked "urgent" because it fixes a publicly disclosed IE vulnerability. Publicly disclosed means that the vulnerability is known to the public and exists "in the wild." Thus, you (and your users) could be impacted by this vulnerability now.
How Do I Get It?
You can find all of the details for this update here.
Download the update as soon as possible. If your users are using IE7, update it throughout your organization as soon as possible. Make it a priority to keep your organization safe.