Reviewer Sites- check out the type of stuff they review FIRST and make sure its your genre. Then check out the contact info and find out what form of book they want. If they prefer paperbacks and you dont have one, that could change things, so do your homework!
http://thenewpodlerreviews.blogspot.com/ -this site seems pretty swamped and may be closed to reviews but they had alot of other blogs bookmarked on their page that looked worth checking out too.
http://thescattering.wordpress.com - I think I heard somewhere that this site only reviews Sf and Fantasy. Check it out first.
The links below are sites that FEATURE your book. This is different than a review because they aren't offering to read it, just post a picture and synopsis, which to me is just as good, if not better, because you dont have to wait for them to read it and get back to you. You can get it posted quicker and if they have alot' of followers/hits on their sites, its still high volume exposure.
Also- for more reviewer sites, try these sites.
http://www.simon-royle.com/indie-reviewers - master list of indie reviewers
http://www.stepbystepselfpublishing.net/book-reviewer-list.html - Kindle specific reviewers are listed here.