Google Site Flavored Search

ChrisG mentions that Google's site flavored search automatically suggests categories for websites, and that generally it has spot on results.

I am sure it is only a small sample of what Google's technologies do, but it is interesting nonetheless, and it may tell you what Google thinks of your site as well as help you think of related categorical sites to get links from. Maybe it would also be a good way for a small new directory owner to grab a unique category structure for their site?

On a side note, apparently Google has no idea what Black Hat SEO is...