Google have recently announced that they are going to fight search engine spam much stronger than before. They have been testing various changes which would help in the lowering the spam level. One of these changes is aimed at sites which have no original content or sites which copy content from other sites. They also plan to give options for users to give feedback about spammy and sites with low quality.
As per a recent article that I found on the net, Google is mainly concentrating on 3 major ways by which it could fight the spam sites in 2011 and are listed below.