According to a story at VentureBeat, "Google is working on a new database of flagged images of child porn and abuse that can be shared with other search engines and child protection organizations. The database will help create systems that automatically eliminate that sort of content. ... If the database is used effectively, any flagged image in the database would not be searchable through participating search engines or web hosting providers. And maybe best of all, computers will automatically flag and remove these images without any human needing to see them." Here's the announcement.