Synovate is currently accepting applications to join their survey/product review panel. I joined Synovate a couple years ago and have gotten lots of fun freebies (plus gift cards!) from them. If accepted, Synovate will send you occasional surveys about new products and advertising. Each survey you complete earns you points towards gift cards and occasionally you will be given full-size free products to try for free!
I have gotten free boxes of cereal, diapers, baby wash and other food products from them to try out. Being a Panel member is easy and fun.