We've all heard of the duplicate content penalty, but what is it really? In this interesting video from Google's head of webspam Matt Cutts, he explains some of the nuances regarding duplicate content. One interesting point to note,is that he acknowledges that about 25-30 percent of information on the web is actually duplicate content. He also talks about clustering as a solution to some duplicate content issues. Check out the video below and don't forget to let everyone know what you think in the comment section as well.