Google is reported testing an enhanced version of last year's “Digg style personalizing search results”experiment that allowed users to hide search results and to move some results at the top of the page. The new experiment adds an option to comment on a search results and to view everyone's edits.
Google FAQ, “your comments and the webpages you add, promote, or delete, along with the user nickname for the account you're logged in with, may be viewed by other Google searchers also in the experiment.” Google mentions that this is “an experimental feature served to a random selection of participants and may be available for only a few weeks.”
Justin Hileman posted more screenshots that show some other features: you can search everyone's edits and there's a list of search edits for each user. “This whole thing looks like an experiment into crowdsourced search results.”
Source:→ Google System