Vysnu is now an X-Phile. Thanks to Evan Goer who manages the list and runs that site, he was extremely helpful in helping me make the grade.

For people who have difficulty satisfying the third criteria to make the list, which is: The MIME-Type Test (sends application/xhtml+xml to conforming user agents, i.e. Mozilla), I have a link from Evan to help you along:
Mark Pilgrim’s Article on XML.com.