Having links that go from other websites to yours is one of the variables that will help your search engine rankings. Highly visited websites are particularly valuable. One key link that many do not take advantage of is a yellow pages listing of their web address. It appears in blue in the book version and is also placed on-line. Many search engines, especially those interested in local search results mine their data from these on-line yellow pages. It's cost per year is small, but well worth it.