A few bits of info from their website:
What is the National Consumer Panel?
The National Consumer Panel focuses on measuring consumer attitudes and behavior. The panel is made up of people just like you, whose opinions help manufacturers and retailers make decisions on what products to develop or improve.
What's in it for me?You'll earn gift points that are redeemable for name-brand merchandise, including electronics equipment, jewelry, household items, toys, and much more!
You'll also earn entries into our many exciting sweepstakes. But, above all, you'll be making your opinions count!
How does it work?As a panel member, the National Consumer Panel will provide you with a hand-held scanner. Every time you or members of your household shop, you'll use the scanner to scan the barcodes on all of your purchases.
Then, once a week, you'll send us your purchase information. It's as easy as that!