It’s official – Google will be kicking the AdSense spammers off the network.
What AdSense spam is are those sites which you arrive on via either organic search or PPC results (usually the former) and you find nothing but RSS feeds or chopped up articles on a very basic template. The sites rarely have any contact information. To be blunt, they are of no value at all except to their owner who brings in traffic at one price and sells it off at another price.
Keep reading AdSense Arbitrage Coming to an End - Internet Marketing