The Basics: Family Review Network is run by a group of blogging moms who work directly with PR agencies and companies to line up product reviews. Then they pass those opportunities on to all members of the network. Some campaigns are open only to a limited number of bloggers, but that is always acknowledged up front.
Some of the review campaigns that have run through Family Review Network include:

Pledge Multi-Surface Cleaner
Eye Buy Direct prescription glasses
Skin MD lotion
Zenses for Nintendo DS
DaBib
Nature’s Source cleaning products

The Logistics: Network reviewers are allowed to apply only …

If you’ve thought about writing reviews on your blog, I bet you’ve had some questions. Here are some of the most common questions and their answers.
What kind of products would I review?
Products for review are as varied as the types of blogs out there. When you partner with a review network, the items are geared towards kids, moms, or general household. You are always given the option to opt-out (or not opt-in) for each review campaign.
Do I get to keep the products?
Although I’m sure it can happen, I’ve never seen …

Review blogs are a nice little niche to explore if you like the idea of reviewing free products and sharing your opinions with your blog readers.
When it comes to reviewing products, you have a few options. You can create a blog just for reviews, start a second blog that focuses on reviews, or add reviews into your current blog content.
That last option is probably the best for newer blogs, although there are some ad networks that do not allow reviews of products over a specific dollar amount to be run …