The dow website says this
"Please let us know what you think of
www.dow.com by taking our survey. You'll be automatically entered into a drawing to win one of ten $100 Amazon.com gift certificates. Thanks for your help!
Take our survey
The drawing will be held following completion of the survey and winners will be notified via e-mail by November 30, 2002.
Note: Dow employees and their families are not eligible to win the drawing, but they are invited to take the survey. "
Now, I assume that this holds true for zetabon too..so it is not a free gift certificate for all
Good Luck