In March, Microsoft announced that their upcoming Internet Explorer 8 would: "use its most standards compliant mode, IE8 Standards, as the default."
Note the last word: default. Microsoft argued that, in light of their newly published interoperability principles, it was the right thing to do. This declaration heralded an about-face and was widely praised by the web standards community; people were stunned and delighted by Microsoft's promise.
This week, the promise was broken. It lasted less than six months. Now that Internet Explorer IE8 beta 2 is released, we know that many, if not most, pages viewed in IE8 will not be shown in standards mode by default.