Most of google.com URLs are Supplemental using -inurl:www

[SEOPTI]

This is interesting:

site:www.google.com -inurl:www.

Almost 50% of their sites show supplemental results. When you go to the last page, you will even get omitted results.

[tedster]

Looks like mostly obscure areas of the Google Directory, plus some search results pages. I see only 90 some results before hitting the 'omitted results" link. It's a very different picture when you drop the "www" from the domain name

site:google.com -inurl:www

What is returned is not Supplemental Results, just Google urls that obey the minus sign, the exclusion, as you would normally expect.