Talk about the ultimate in free samples!
I have been a member of Vocalpoint for a few months now and I am LOVING it. I have gotten a free (full sized) "sample" of the new Bounce Dryer bar, plus a high dollar coupon. I recently registered to get a free Secret Deoderant and Olay ProX cream. The only requirement is that you check back in to give your opinion on the product.
They have other features too including focus groups and surveys. The more your participate in, the more stuff they send you!
I only recommend sites that I have personally tried and think are worth your time to check out. My motto is, "If it's free, I want it!"