First off, I think that the google sitemap generator tool is an excellent idea. Once it is ready I think using up it's robot software a broken link checker similar to Xenu link sleuth could be created easy.
My main idea is a bit different. As a lot of webmaster use free or paid directories to establish the seo of their website we could create a backlink builder tool.
Okay let me demonstrate it with an example, I am the visitor for the tool and my main keyhrase is 'software' and I look for directories which may pass some keyword authority to my website.
I would like to see two radio button where I will be able to set my preferences
i. The label of the first would be: Are you looking for a FREE or Paid listing?
ii. The second would be: Would you like to use our directory database or rather prefer our websearching algorthm.
As the options reflect there would be two different optional inputs for the tool. First one is for instance google. If I set the free listing and want to use the seraching algorithm the tool would return the results for this example searching query
Quote:
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inurl:software intitle:'free directory'
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If I would have set the use of the tool database the result would have been the list of the related pre registered directories.