Oddsunflower,
Way to knock the interview out of the park. Why I know you said you are going to take this job, good for you to interview for the other two. The practice interviewing never hurts. Plus if something happens with the first job interview you haven't looked bad by blowing off the other two, You should be proud of yourself. I am also impress that you had the courage to call the IRS. I know that could not of been an easy call to make. All in all you not to shabby of a day.
