Yahoo! has created a badge which shows the backlinks a site gets. It enables a person to place a code on their respective site to indicate the number of links to they have to a particular page on their site.
Yahoo! Site Explorer says:
Add a live badge to your blog or website that queries Site Explorer for the number of links to your site or page on the web. Select the type of link counts you want, the size and look of the badge and then cut and paste the code to your web site.