VG - as you know I'm very happy with the way the testimonials have worked for me. The links to e-mail addresses is an easy way for potential clients to verify that you didn't just make them up. I think people are reluctant to call people on the phone - so an e-mail works better. Always ask permission to include the e-mail and don't include it if they admit they don't check their e-mail often (a lack of response may work against you). I also included picture of my clients to make it look more personable.
Check out my website (
Testimonials Derby's Pet Fence, Louisville, KY | Invisible Protection for your Dog) for what I think is an effective use of testimonials. I even got one from someone that got a refund because I wanted to show they were real and not just a bunch of fluff.