Help your customers trust you by displaying logos and badges of third part services that you work with.
If your site is relatively new, chances are people are not familiar with your brand and have no reason to trust you. If you deal with or are certified by brands that people know and trust, display their logo prominently on your site.
Most shopping engines offer their logo for use on retail sites. Anyone who uses these sites regularly will feel slightly more comfortable with placing an order on your site when they see it. If you accept PayPal, Google Checkout, BillMeLater or accept payments through any other trusted channel, display that logo too.
Consumers need to feel like they can trust you. Tell them why they can trust you.
It seems fairly obvious but so many eretailers don’t take advantage of some so very, very vital.