Here's a great one that just went up on the VeriSign site the other day. European online travel giant Opodo recently measured the effectiveness of the VeriSign Secured Seal in increasing sales. Opodo sent traffic to the exact same set of Web pages except that one batch of site visitors saw a page with the VeriSign Secured Seal present and one did not. Sales on the pages with the seal were 10% higher than on those without. You can read the full case study on how Opodo uses VeriSign SSL to increase online commerce transactions here.