We use testimonials both on our site and on printed material. It does give people a sence of realness or security (even though MANY small companies fake this part). I've got a few people that I deal with for copywriting services. Everything from taking existing content and reworking it for web versus print, or people who can work from a clean slate with limited ideas.
If interested, please PM me and I'll get you some links. They are paid services, and not cheap, but depending on your margin of return, well worth the investment.