I have gotten rid of the meta description and keyword tags from some of our articles... I was surfing a few Google sites and noticed that they do not use any meta tags. Take for example Matt Cutt's (Google Employee/Insider) blog. Take a look at his source. No keywords or descriptions. He ranks for plenty of search terms. Also, take a look at any other Google page (ex: Adwords) - no keywords or description.
Do they no longer play into ranking? Since I have dropped these, can anyone predict what the outcome will be?