One topic of controversy regarding web standards has been Internet Explorer 7 not supporting the application/xhtml+xml MIME type, which essentially means not supporting true XHTML as specified by the W3C. Of course with this being related to Microsoft there is the expected amount of flak coming from the anti-Microsoft camp. That said, even once you've filtered out the extremes from the discourse, there are still a lot of people who think Internet Explorer 7 killed/is killing XHTML. [More]