In a recent thread at WebmasterWorld, some members have reported that Google is asking searchers to suggest some URLs for specific searches. "Help improve search for everyone" is how Google is asking for suggestions. Google asks the users to
Click a link to submit a link. The link open a form where you need to login.
After the submission of the new URL is done, it takes you to a 404 page that is at http://www.google.com/reviews/w/nominate.
Forum discussion continues at WebmasterWorld.