'Google Promotion' Ad by Google Webmaster Tools On 'Site" Operator's Query Result

Google is reported displaying a special ad when your search query includes the "site: operator," followed by a domain name: "Do you own domain.com? Get indexing and ranking data from Google." Many webmasters use the site: operator to check the number of pages indexed by Google, so it's a good opportunity to promote Google Webmaster […]

Google is reported displaying a special ad when your search query includes the "site: operator," followed by a domain name: "Do you own domain.com? Get indexing and ranking data from Google." Many webmasters use the site: operator to check the number of pages indexed by Google, so it's a good opportunity to promote Google Webmaster Tools.

This isn't a regular AdWords ad, since it's labeled as "Google promotion".

[Thanks, Alex]