If you choose, you can request that everyone putting a link on your website must also provide a link on their website. This will give you major internet exposure. When your links site becomes popular, you can charge for premium placement of links. Every department on your links site has prominent links you control. Use them to promote your other websites or to sell.
Visitors add links automatically.
You then review and decide if you want that link on your website. Visitors can modify their links at anytime. You then review and decide if you want to allow the modification. All links can be rated by the visitors. An advanced search engine, similar to Yahoo, is on your links site for easy searching.