What Should One Do After the Interview?

FattyBoeBatty asks: "So I finally find the perfect company to work for. Unfortunately, they're only going to hire 3 out of the 200 people they're interviewing. So here's my question: I know there are a lot of slashdotters in charge of hiring - what post-interview actions do you like to see on the part of the interviewee? Is it possible for him/her to seem too enthusiastic about getting the job? How often should one call to inquire about the hiring process and re-express interest? What about mailing/emailing the company? Do you guys have any examples of when someone managed to stand out (or appeared too annoying)? I've never seen a question like this addressed in detail; I hope the Slashdot community can give me some sound advice."