I've done well with reviews on Smashwords.
My author page:
http://www.smashwords.com/profile/view/SWolf
Of course, most of my books were free for the first six months, so there were plenty of downloads. Here's how the downloads match up with the reviews:
Amulet: 11057 downloads, 16 reviews
The Touch of Isis: 8555 downloads, 2 reviews
Vampire Tanning: 6370 downloads, 7 reviews
Eternal: 3836 downloads, 4 reviews
Erato: 3664 downloads, 5 reviews
Remote Intimacy: 3546 downloads, 3 reviews
The Gazelle: 1342 downloads, 4 reviews
Killing Max: 1037 downloads, 2 reviews
Amulet 2: 202 downloads, 2 reviews
Sex Zombies: 20 downloads, 0 reviews
And I've used excerpts from those reviews in my Amazon descriptions.