In Visual Studio 2010 Tabs Studio uses separate default style. As in .NET 4.0 OuterGlowBitmapEffect is no longer supported, I changed its usage to DropShadowEffect. DropShadowEffect is less visible, but at the moment I don’t know what else to use. Notice less red over close tab button and less white over selected tab content in Visual Studio 2010:
Mouse over close tab button in Visual Studio 2008
Mouse over close tab button in Visual Studio 2010
Default style for Visual Studio 2010 also sets transparent tabs background.
Tabs Studio Blog (organizing Visual Studio document tabs) 