http://www.theindieview.com/indie-reviewers/. Read over the list carefully.
When you find reviewers for your genre, make sure that you go to their website (usually listed in the above list) and READ THE INSTRUCTIONS IN REGARD TO ASKING FOR A REVIEW. Not following instructions will mean you will be ignored. Some of them are not always taking review requests, as they get behind after so many requests. If they are not currently taking requests their website says so.
Make sure that you keep a list of those you contact and actions taken. You want to stay organized.
Use facebook.com to find book blogger sites. Enter in keywords (fiction, reader, romance, mystery, etc) to find these pages. Some of them let you show off your book on their page. Don't do it until you ask! Spamming is not a good way to get attention. In fact, people hate spammers and will make sure NOT to buy your book. Look in the pages information page to see how to contact them for both permission to post your book AND to request a review.
There are some pages who always let authors show off their work. Here is a great one: Authors on the Cheap. In fact, you can post one book every 24 hours. They own several sites and sometimes post your book from this site onto their others. Make sure to read their information on how they want you to post your book. Look at the other books there and you will see the format.
Hang out at kindleboards and go to their Writers' Cafe on the home page. Once there, you will often find review and interview opportunities.
When you do get responses from people willing to review your book, make sure to ask them to post to Amazon, B&N, and Goodreads. Ask them to tweet the review and facebook it. Also, ask to be let know when it goes live so that you can promote it and them. Be polite, be punctual in providing what they need, and pay it forward. Mention them on social networks other times besides when they promote you.
Have fun watching the reviews roll in.