Be careful, some of the dialogs in Visual Studio 2008 break if you install Internet Explorer 8. Here’s one example.
In an ATL project, in the Class View, right click on an interface and select “Add Property”. The following error appears now.
Internet Explorer Script Error
Line: 731
Char: 5
Error: Object doesn't support this property or method
Code: 0
URL: file:///C:/Program%20Files/Microsoft%20Visual%20Studio%209.0/VC/VCWizards/CodeWiz/ATL/Property/HTML/1033/default.htm
The property creation dialog that follows does not work anymore. Here’s what the dialog looks like now. Notice the Internet Explorer information bar at the top.

I have submitted the issue to Microsoft. The Connect bug report can be read here.