inurl:domain site:domain.co.ukThe order is not completely accurate but it does highlight which pages on your site are the most valuable.
Example: inurl:bbc site:bbc.co.uk
I discovered this tip on a fantastic post on SEOmoz (with a very dodgy buzzwordy title) which provides an easy to tick off list of 10 SEO improvements you can make to your site.
The use of this Google operator in tip number 2 is so that on finding your top ranking pages you can place internal links on them to provide some link juice to lesser ranking pages. However there are many other reasons why this information may be useful to you.