If you have not heard there is a pretty serious patch out for Internet Explorer. This patch is coming out of the normal cycle so it must be important.
The patch relates to an issue found in the way that IE handles object in memory and tables. The issue affects people running with Admin rights more than it does a standard user.
The flaw exists in the Active Template Libraries in Visual Studio. So someone could craft a malicious website with these and setup a drive by site. Once a user visits the site they could become infected based on a few known vectors in the way IE handles these objects.
The patch is recommended for all versions of IE including IE 8.
You can read the MSB here