Simple Exploit Poses High Threat
Be sure to implement Microsoft's fix for the recenlty discovered Windows Print Spooler Remote Code Execution Vulnerability. See this post on the Microsoft Security Response Center. This exploit allows a hacker to use the printer spooler to perform privileged operations such as installing programs and deleting files.
The metrics on the Microsoft site show that while the complexity of this exploit is low (special access is not required) the threat to the confidentiality of data and the integrity of your system's protective measures is high: