Google lets users block sites from search results to prevent Spams

Google is pretty good at finding what I need, but when researching a more obscure topic, most of the results point to the same nasty link spam site that not just gets in the way, but is terribly annoying too.

The feature is starting to roll out today look for a "Block all example.com results" link next to the Cached and Similar links. After hitting the link, any future searches will exclude the site you blocked. A notification appears if some search results were excluded because their site is blocked and you can choose to view them. You can manage blocked sites from the settings page.