QUOTE(benjaminfranklin @ Sep 5 2012, 03:18 PM)
If you used duplicate content or bad content than you will be penalized by the PANDA. And if you used to creating un-natural links then you will be penalized by the PENGUIN.
I would complete the list with the number of un-natural links and "bad neighbors", sites that proved to break the Google SEO rules, which have had a great impact to websites.