Do you like to try products for free? If so, you'll definitely want to consider signing up for BzzAgent and Tryology.
BzzAgent offers free products in exchange for your willingness to provide word-of-mouth feedback to your friends and acquaintances. One of my friends loves this program and said she just signed up for some free Burt's Bees baby products. That's enough to get me to consider joining! Go here to sign up. (Thanks to Brooke for suggesting I post about this program.)
Tryology offers free full-size products in exchange for short video reviews. They currently are offering a free box of Honey Bunches of Oats, a free box of Nabisco 100-Calorie Packs, a bottle of Gain Detergent, and more. Go here to sign up.
If you've worked with either of these companies, I'd love to hear your thoughts and experiences.