By far, the most useful free product for a small business advertiser is Google Analytics. Here's what you get: real information about who visits your website. What did they type to find you, where they are, how many pages did they read.... there is a ton of stuff that can teach you what needs to be on your pages. Search results are free-- both to you and to the reader. If you can't see how and why people find your business on the internet... then why are you on the internet?
How about that? We make advertising, but we know that enough is enough! Adding a link that helps you get rid of advertising? Some might start to think that real people work here.
This is a truly nifty idea... reduce the advertising that YOU get!