I just made a post on the IE Team blog regarding Zones and Mark of The Web. It's always a good idea to test with default settings and run pages in the internet zone if that is where they will be deployed so that you experience what users will experience.
As noted on that post I'm leaving Microsoft after eleven years. It has been a difficult decision to leave a place that has been part of my life for so long but some things can't and probably should not last forever. My reasons for leaving are personal as it is time for me to make a few changes in my life. I wish the IE team all the best and I'm looking forward to seeing the next versions of IE.
Thanks to everyone both inside and outside Microsoft for some great times-Dave