Checking your inbound link count with Yahoo! Site Explorer
Yahoo! Site Explorer allows you to get information about backlinks, crawl errors, and search traffic to your websites. In order to get the maximum value from this tool, you'll need to authenticate each of your websites to prove that you own them. To get started, go to http://siteexplorer.search.yahoo.com/ and type your root URL into the box at the top of the page. Click on Explore URL to see a list of the pages that Yahoo! has in its index.
One core use for Yahoo! Site Explorer is that it presents a highly accurate picture of one's inbound link counts. If you recall, Google does not present accurate inbound link counts to users. Thus, Yahoo! Site Explorer is the most authoritative picture you'll have of how many backlinks your site enjoys. You can click on the Explore button next to each page to see how many backlinks Yahoo! sees for that page. If you want more information, you'll need to add the site to My Sites and authenticate...