Getting online reviews is important. Getting online reviews on the right sites is even more important. If you have a choice, you almost always want the site that gets the most traffic. Try using Alexa.com to determine which one that might be.
Complete Guide to Online High Schools has just been reviewed on About.com. If you have not sent a copy of your book to an About guide with a related topic, you've just made your first mistake. Thankfully, it is an easy mistake to fix.
About.com gets huge traffic. My review just went up on the site last week and it is already showing up in the second spot when I do a Google search for my book title. The only site that beats it is Amazon.com.
Google is your friend. Use it. And that means that traffic is king.
The one and only exception is niche sites that don't generate much traffic, but that get you folks who will buy your book. That's why I started this post with an almost-lie. The real truth is that, if you have two places to get articles or reviews, choose both.