Marketleap's Link Popularity Checker
The best way to keep upto date with how many backlinks your website has is to use Marketleap.com's link popularity checker, it has been around for years and it is one of the most important SEO tools there is. You type in your domain name into the tool and upto three of your competitors domain names, type in the access code and then hit generate report, the tool will then give you a report showing how many backlinks you and your competitors have on the three most important search engines Google, MSN and Yahoo. Heres a link to the tool, enjoy!
Marketleap.com link popularity checker