I ended up writing each person an e-mail. Each one was different, but basically said the same thing- Thank you for the opportunity, if you have any other questions I'll gladly answer them, yada yada yada. I only talked to each person for 45 minutes to an hour a piece, and they all, with the exception of the final person, pretty much asked the same things. I'd have written a short note and sent it, but the company, an advertising agency, uses e-mail a lot. In fact, its how I got to know about the job and how I set up the interviews. I sent them after I got out of class which was after the place closed, so they probably won't get the messages until tomorrow morning. I just wasn't sure if I should send a message in the first place, just because I wasn't sure if it would make me seem too eagar and kiss ass.