Handwritten notes are appropriate if you'd like to extend your thanks to others in the office who you felt helped you out. What to Say What is more important is what you say and how you say it. Recap some of the conversational highlights. Clarify any information you needed to check on for the interviewer. And most importantly, plug your skills.
Interviewers have short memories.
A thank-you note is your final chance to make yourself stand apart from all of the others who want the same position.