What is "Quality Content" according to Google Panda Update?

On Feb. 24, 2011 Google began instituting a series of major changes to their algorithms with the goal of more effectively distinguishing "high quality" from "low quality" sites in effort to return the most relevant, and helpful results to their Google users.  Now, more than ever, if an affiliate doesn't add value beyond what the supplier adds, they can expect a lowered page ranking.   Effectively, this can be seen as a call to action for affiliates to strengthen their work, provide quality, and use their own authentic voice.