How many people here actually use testimonials to increase their conversion rate. Since our directory have started adding more testimonials, we already see a increase in submissions. http://www.excellentguide.com/testimonials.html
Aviva has had this for a while and it has worked well: http://www.avivadirectory.com/testimonials.php Testimonials help by giving social proof. You may be good, but it's better if other people say that you are good. It gives a lot more credibility to the claims.