As many of you are aware a new exploit in IE was used against Google and many others to attack their networks. Tomorrow on January 21st Microsoft are planning to release an Out of Band Security Update. It covers IE6, IE7 and IE8 on all platforms: Windows 2000, XP, 2003, Vista, 2008 and Windows 7.
More details here and here. I would highly recommend you patch at the earliest opportunity! ;)