Just can't understand with a all the rhetoric about standards complaint browsers along with testing Acid 3 & HTML5 that your website fails validation, largely for petty reasons. That's hypocritical and a serious ding on your credibility for neglecting to enforce W3C standards. In this context of browser showdown there's evidence that browser testing using fully compliant website produces different results.
(FYI: www.msn.com usually passes validation.)
As a tech leader its incumbent and expected to LEAD with best practices!