At the beginning of this year, Google made a change to their algorithm to eliminate duplicate content and attempt to find and give credit to the original author. This was in effort to fight the war on spam websites that are getting search engine ranking by copying good quality content and bumping the original page down in search results.
Last night at approximately 10:30pm, we did a rank evaluation on one of our clients and found that their Google Pagerank (PR) increased from 0 to 3. After further inspection, several hundred websites saw a change in pagerank last night as well, more losing than gaining. Fishpunt.com advanced in it's internet authority from a PR 2 to PR 3, even one of our project sites advanced from a PR0 to a PR1.