http://trends.google.com/websites?q=democraticunderground.com%2C+freerepublic.com&geo=all&date=all&sort=0The blue line is DU, the red line is FR.
See also, Barack Obama v John McCain:
http://trends.google.com/websites?q=barackobama.com%2C+johnmccain.com&geo=all&date=all&sort=0A new layer to Google Trends
Friday, June 20, 2008 at 9:13 AM
Written by R.J. Pittman, Director of Product Management - Consumer Search Properties
Two years ago, we launched Google Trends, a tool that lets anyone see what the world is searching for, and compare the world's interest in your favorite topics. Last year, we added Hot Trends, which shows what people are searching for right now - the fastest rising search queries on Google, updated every hour. And just last week, we introduced normalized search volume numbers available for export in Google Trends.
Today, we add a new layer to Trends with Google Trends for Websites, a fun tool that gives you a view of how popular your favorite websites are, including your own! It also compares and ranks site visitation across geographies, and related websites and searches.
More:
http://googlewebmastercentral.blogspot.com/2008/06/new-layer-to-google-trends.html