Erica dela Cruz - From Inside AdSense Team says in Blog Post
To help us better understand what's most important to our publishers, we've recently started conducting email interviews. Interviews are currently available only to publishers located in North America, but we're aiming to expand this program to other countries in the future.
If you're located in North America, you can sign up for a chance to participate in an email interview and openly discuss your opinions about AdSense with a market researcher. Participants will receive a $50 AdWords credit for their time.
If you're interested, fill out this form to let us know. We'll be contacting chosen participants via email; because space is limited, we won't be able to accept all applications.
Source : Adsense Blog Post
