Surveys show that trust marks and logos from well-known providers help to lift sales due to improved buyers confidence in your web-site. Buyers confidence leads to better conversion rates in result.
HackerProof Trust Mark that provides more website credibility with a free trial from Comodo, an approved PCI Compliance Scanning Vendor (ASV) and WebTrust compliant company.
McAfee Secure for Websites is the world's most comprehensive web security certification service, a comprehensive evolution of ScanAlert's HackerSafe. Gives an average 11% sales lift according to me...