Google has announced real-time search.
That means Tweets and Facebook status updates will appear in Google searches. It also means that blog posts will take more priority. You can try out the search at Google Trends.
This means that more than ever, having frequently updating content will help your website grow. Real-time search also takes up some screen real estate at the top of the Google search results page. That means every other site on the page has been pushed down. If your site was ranked 10th, it’s now on the second page.
Obviously this won’t impact every industry and every search term, but it’s yet another example of how having high-quality, frequently updated content helps websites.