After the Interview
While you may be tempted to put your feet up and sit by the phone after a successful interview, don't pat yourself on the back yet. Even if the interviewer asked you questions about your salary requirements or asked something along the lines of ?If we were to hire you, when could you start?? it doesn't mean she's made her decision. After you've shaken hands and said goodbye to the interviewer, take nothing for granted.
Source: http://www.netplaces.com/job-interview/after-the-interview/