Anyone having success with Amazon Review sites?

Advert test
So Amazon review sites seem to be all the rage right now, and I've only seen a few in action. Anyone doing a decent amount with them to share some tips and maybe a good WP theme to get a few sites running?
I personally haven't had any success with them, because I haven't used them but I know a few people who have, and they're doing quite good for themselves - seems to be a good way to get the income. I'll see if I can get some tips for you. Good luck though.