Users are advised to update QuckTime ASAP and to recheck it in a few days (or set it to automatically check for updates).  This flaw has been actively exploited on MySpace and can steal users passwords.

Get the update directly from Apple at the following link: http://www.apple.com/quicktime/download/win.html

Most all versions of MS Office and MS Works for Windows and Mac are vulnerable to malicious word documents.  It is advised that no unsolicited doc files be opened by users.  They may arrive as email attachments.  Do not open or save any .doc files received from the Internet.  It is worth noting that Microsoft has been unusually strong in the wording of their warning.

For more info:  http://www.microsoft.com/technet/security/advisory/929433.mspx

A patch may be available on Patch Tuesday, December 12.

Critical security vulnerabilities have been discovered in Adobe Reader and Adobe Download Manager.  Users are advised to upgrade Reader to version 8.  It can be found at:  Reader

Adobe advises that the download manager be uninstalled.  For more info, visit Adobe here.