I was wondering if anyone knows of a tool that searches hyperlinks on the web? I am desperately trying to locate a referring site that sends a lot of traffic using a unique URL string and unfortunately I dont have access to log files. I thought copenic used to have this option but I was mistaken.

Have you used Google and MSN to search for that unique URL string?

Yes but unfortunately the string wouldn't be found as charaters on the page - just in the html of the link.