I may have just overlooked this but I feel it is fairly new. Googles 'webspam Action' its under the "search traffic" section of your google webmaster account and the name on it is "manual actions". It lets you know if anything is going wrong with your website, or if google has taken any actions against you.
Also was wondering what is the best number of key words for a page for all search engines, not just google. Is there a specific character count I should stay under?