Heise Security Online reports about unscheduled patches for MS IE and Visual Studio. Affected are:

Versions 5, 6, 7 and 8 of Internet Explorer,
Visual Studio .NET 2003, 2005 and 2008,
Visual C++ 2005 and 2008

running under Windows 2000, XP, Vista and Server 2003 and 2008.

QUOTE
25 July 2009, 19:12
Unscheduled patches for Microsoft IE and Visual Studio

In a "Security Bulletin Advance Notification" on TechNet, Microsoft announces that two unscheduled security patches for Internet Explorer and Visual Studio will be published on Tuesday, 28 July. This is unusual and indicates a particularly serious security vulnerability, since Microsoft normally provides software updates in batches on the second Tuesday of the month, known as “patch Tuesday”.

More about:
http://www.h-online.com/security/Unschedul...o--/news/113846
http://www.microsoft.com/technet/security/...09-jul-ans.mspx