New search engine for webmasters - what features would you want it to have?

[jv16]

We are in a process of creating a specialized search engine targeted for webmastars and business owners.

I'm afraid I can't tell you all the details yet, but one neat feature it will contain is an advertisement search: you can type in the URL of your competitor, for example www.microsoft.com, and the service shows you a list of websites in which Microsoft advertises on. And this happens in a matter of seconds, of course.

So, are there any features you would like to see in such search engine service?

PS. I'm sorry if this is the wrong forum for this kind of message