Many mothers believe that the single most important activity you can do with your children is to read to them at night, help them with schoolwork to make sure they get good grades, or make sure they are always nearby. …
Initially, I contacted companies. Now, a lot of times companies contact me. If there is something that I think my readers would especially be interested in though, I'll still contact the company. You can find the marketing or pr contact person's information on most company websites.
I think that it's important to approach focusing on what you can offer the company in exchange for their product.
The only review network that pays you a stipend is Mom Central, but not all the time. Depends on what product you're getting to review.
Signing up with a review network is the best way to get products to review. A lot of publicists and companies are contacting me to do reviews, too. I have a "I do reviews" page up at my blogs, which gives them facts on my blog reader demographics and blog stats, how to contact me, and that I do paid reviews as well.