Google has announced personal blocklist extension for Chrome browser which will block domains/hosts from appearing in your Google search results and transmit to Google the patterns that you choose to block. When you choose to block or unblock a pattern, the extension will also transmit to Google the URL of the web page on which the blocked or unblocked search results are displayed.
Matt Cutts has written in a post on the Google blog that the company hopes the extension will improve the quality of search results. extension
Matt Cutts wrote in a post on the Google blog that the company hopes the extension will improve the quality of search results.
More info: http://googleblog.blogspot.com/2011/02/new-chrome-extension-block-sites-from.html