"Most satisfied customers will be happy to provide it. If you are starting out and do not have any customers yet to offer their services or to provide some of your products. Then ask your customers for feedback - if you have done a good job or your product is useful, they will be more than happy to do it."
"Whatever promises you make, make your customers do not believe that others are much more than you (if you have not already established itself as an authority on the subject, or have a strong relationship with them.)"
"You will be amazed at how much valuable feedback, you will be able to collect not just ask about your business contacts directly to them, as well as in the discussions, which were obtained from your blog posts and other online discussions that have taken place because of your presence on the web."