Google probably review their top searches periodically to determine utility related keywords and custom fit solutions to them.

It seems that if they continue to do things this way, sooner or later, Google is likely to replace thousands of utility websites.

This seems like a change in their philosophy from sending users to other websites in as little time as possible, to using Google as a portal.

Interestingly, this change in philosophy by Yahoo from a search engine to a portal was what made Yahoo lose out to Google.