I've implemented Virtual Earth within many web applications, but one thing that I've only had to do a couple times is run the site under SSL. If you have ever done this, then you know that the web browser doesn't like this and complains with the "Do you want to display nonsecure items?" prompt. This can be a pain for users, escpecially when they click "No" and then wonder why the map isn't there. Yes, even though it isn't documented, Virtual Earth does support being referenced under SSL. To reference Virtual Earth v6 using SSL you must pass "s=1" in the querystring, as well as use HTTPS.