Advice - if there's a program you have not yet heard back from, and really want to, then email them and mention how interested you are, and why, and see if they have any spots available to interview. I netted a few interviews this way. Think about it - you have exactly nothing to loose. What's the worst case scenario? They say no? You didn't have one to start with, so what's the harm in emailing? Give it a shot!