A WebmasterWorld thread is reporting that some members are noticing that Google is asking searchers to suggest other URLs they would like to see come up for specific searches.
Google says on the search results page, "Help improve search for everyone." Then asks you to click a link to submit a link. The link is something like this and takes you to a form that looks like this, after you login.
After you submit the new URL, it takes you to a 404 page that is at http://www.google.com/reviews/w/nominate.
If you do a search for /reviews/ results, you get plenty of results.
Is this a new personalized search feature?
Forum discussion at WebmasterWorld.