Without the help of others your business will never survive. A great way to get the most out of other businesses is to build a network of affiliates who have a say-so in promoting your site. Look for websites that are in a similar industry, but not your direct competition. Essentially, you need to ensure the relationship is mutually beneficial.
You also want to consider promoting your site at social networking events. You may come across other companies in similar industries who would complement your services or products. These companies may be more inclined to exchange website links. To insure a streamlined process is in place, make sure to designate a page on your site specifically for links. You can display this page to those who are interested in exchanging links.
Open up and toss your web address out to anyone that may benefit from it.