And why have they usurped all my yahoo backlinks? Or is it another bug in WebCEO?

Its not a bug, its the redirector from yahoo's search results

when you search for something on yahoo, instead of displaying a regular anchor link to your site in their results, they display a link through rds.yahoo.com with a bunch of junk on the query string that redirects from their site to yours so they can tell what you click on

Mutilated1 wrote:

Its not a bug, its the redirector from yahoo's search results

when you search for something on yahoo, instead of displaying a regular anchor link to your site in their results, they display a link through rds.yahoo.com with a bunch of junk on the query string that redirects from their site to yours so they can tell what you click on

Thanks Mut,

So basically we've made it off the 'ground floor' and become important enough to track? Or something else?

If you're seeing that you're getting links from that, then you know that someone is searching for something on Yahoo! where you're getting ranked in the results.