There are two kinds of review posts: A straight review of a product or a compare-and-contrast of multiple related products.
Many blogs have made a business out of straight reviews of products and services. You can find review posts of books, software, local restaurants and everything in between.
example of a review blog post
Comparison posts can generate interest from people who will ultimately need your services.
I should tell you, though, that reviewing products regularly may get you free, unsolicited samples from people looking to get coverage in your blog, so be prepared for free gifts! (If you ever needed a reason to review bacon on your blog, I just gave it to you.)
As consumers, we rarely if ever have the time to fully test every product in a category ourselves, so we do research on the web. Offer a head-to-head comparison of products to drive a lot of traffic to your site.
In Social Media Examiner’s LinkedIn Networking Club, members are often asking each other if anyone has experience or advice on one piece of marketing software or another. It’s handy to be able to point someone to a direct comparison of a few tools.