Matt Cutts write Confirming a penalty where he specifically is talking for Google in his post. He said in a bold statement;
I can confirm that Google has removed traffic-power.com and domains promoted by Traffic Power from our index because of search engine optimization techniques that violated our webmaster guidelines at http://www.google.com/ webmasters/guidelines.html.
This is not only huge for Google, in that they have started calling out names of those they ban. It is also huge support for Aaron Wall's Defense Against Traffic Power.
As you can imagine, there are many forums talking about this including;
