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.
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Toxic Free Blog - by Brittany Glynn
Brittany is a director of the Toxic Free Foundation and created the first ever Toxic Free Certification Program. Weekly, Brittany publishes the Toxic Free Blog and provides coaching to over 10,000 families in the United States alone. She is the author of a Toxic Free educational series and co-author of several Toxic Free learning programs. Brittany is also an award winning author.