BenFox - 4:13 pm on Apr 5, 2011 (gmt 0)

You can do what Planet13 recommends yourself if you've got the right tools.

In this case the right tools are an itemised list of domains linking to your major competitors and a pivot table.

Use the pivot table to find which sites link to more than 3 of your top 20 competitors and voila - an instant list of potential leads.