via:scrubadubwebcssdevelopmentstandardshtmlieie8microsoftIEBlog : Microsoft's Interoperability Principles and IE8
IEBlog : Microsoft's Interoperability Principles and IE8 blogs.msdn.com
Old, but I keep misplacing this link. "We’ve decided that IE8 will, by default, interpret web content in the most standards compliant way it can. This decision is a change from what we’ve posted previously."