re: Writing Thank You after Interview with Multiple Interviewers

My last interview about four years ago, I sent emails to everyone who interviewed me (about 7 people). I made sure to personalize each email, not just changing names, but threw in a quick sentence thanking them in particular for something--ie one person for clarifying my question about x, another for being candid about the pros/cons of working there (she was quite candid).

I also sent a handwritten card to the main boss.

I think email is a must for the following reasons:

1. It gives immediate feedback, not only reinterating the fact that you are interested, but I got a quick response from everyone I emailed, which basically let me know I was going to get an offer. One person emailed me back saying they were looking forward to working with me.

2. It opens up the communication lines if you had any follow up questions (less awkward than a phone call).

3. It can add several contacts--if you are a strong candidate who doesn't get the job, you can follow up the thank you note with a quick email saying you were sorry it didn't work out, and politely ask to keep you in mind for any future openings in that industry (either at that company or another), and they have an easy way to get in touch with you.