Use a physical street address, not a P.O. Box. List your fax number, and toll-free ordering number if you have one. Give visitors links and benefit-related teasers that lead to separate pages. Than Once Setting cookies can help you better serve your visitors. However, many people believe cookies are an invasion of their privacy.
Many sites offer free consultations or information, then fail to deliver.
This can permanently damage your credibility. Many sites have non-secure or confusing ordering procedures. If you have more that 2-3 items for sale, invest in a shopping cart ordering system. They'll just click away. JavaScript pop-up windows can be annoying.