“RE: First Public Secure Site via TLS”

I'm showing my ignorance here about the protocols used, but why doesn't IE (OS X) show its padlock in the lower left corner, which I, and more importantly every other internet user, have been dogmatically trained to look for? It's such a trivial thing in terms of feedback, but no matter how secure the link, people (my clients) won't believe that they're secure without it.