If a place asks you for a second look, they are likely interested in you.
Be careful in trying to not look too over-eager. I can tell you several times someone being over-eager ticked off the program coordinator. Remember, the program coordinator is someone who just like you is a human being. Getting 10 phone calls a day from someone, appearing needy, and bothering the coordinator is not going to help your chances on getting in. In most programs, the coordinator is the program director's right hand man or woman. A simple comment such as "That guy just keeps calling me and he's frustrating me" is often enough for a program director to tell the coordinator to knock the guy off the list.
I mention this because I've noticed several medstudents have started to adopt the paradigm of doctor-narcissism and cop an attitude that the "secretary" is of no importance. I've seen some programs where the coordinator (secretary) is actually doing almost the entire operation of admitting medstudents into residency and the program director had no clue what was going on, and was simply just signing the forms and doing interviews--coordinator did everything else. If you pissed off the coordinator, you actually did far more harm to yourself than pissing off the program director.
If you want to imprint the message that you want to get in, I'd mention it during the interview, show enthusiasm, highlight why you want to get in, and write a thank you note, but don't appear needy or call the coordinator several times a day.