[ForeverRoses]

I am in HR and I conduct trainings for our managers who conduct the second and third round interviews. A good rule of thumb that I always tell them is be prepaired to answer any question that they ask a candidate. For example: if you ask "why do you want to work here?" be prepaired for the candidate to ask "why do you work here?".

So if at the end of the interview you don't have any questions, turn around some of the questions that they have asked you. Such as:

Why did you chose to work here?
What attracted you to here?
What would you consider the biggest positive about this company?
What one thing would you change about this company?

Asking questions always shows interest (at least that's how I enterpret it when I am doing a screening interview). And if I am not impressed, you don't move on to round 2.

As for thank you notes, either e-mail or written is fine with me, just keep it professional. And while it might not make or break if you get the job, it does serve as a reminder that you are still out there- we sometimes get busy and resumes get shuffled to the bottom of the in-box or e-mail box!