I've you've started to explore the world of Web Marketing/SEO, you've no doubt learned that one of the most important aspects of driving more traffic to your site is inbound links (also known as incoming links or backlinks).
One excellent, and often free, method is Coupon Codes. Many sites, such as Coupon Cabin are more than happy to list your company's coupon codes, in turn driving traffic to your site and offering a buyer incentive.
In some cases, this does not produce a direct inbound link to your site, but in other cases, it does. Either way, it doesn't hurt.
There are hundreds of coupon sites, another being Coupon Mountain.
Fire up a Google search for coupon codes and start submitting!