Its hard to get people to know and remember your name. Of course, making face-to-face appearances to ask your questions is ideal, but impractical for most traveling people. Since I have been traveling far for my interviews so far, one thing I made sure I did was to drop by the admissions office and get friendly with the staff: ask some general questions to strike up conversations, and not leave until I had some names and numbers/emails.
Aside from that, its a good idea to submit something in writing (not email) which will probably end up in your file. When it comes down to it, there is very little that admissions can find out about us. Do grades, MCATs and some letters of rec (from people that we picked) tell the whole story about a person? I don't think so. If I were running admissions, I'd want to collect every bit of information that I could that adds insight into who we are, and what makes us tick--this would definitely include all written communications (as well as google searchs, facebook,etc...). Pay no attention to admissions people who say sending in stuff is "discouraged". As a policy they just don't want to get inundated useless paper from everyone. So I think you should try to get that piece of paper in the file, because it goes everywhere the file does. That being said, make sure the letter is saying something of substance. The Adcom people have pretty sensitive BS meters.