Google Trends

There's a great new service, courtesy of Google, that lets you search trends:

With Google Trends, you can compare the world’s interest in your favorite topics. Enter up to five topics and see how often they’ve been searched on Google over time. Google Trends also shows how frequently your topics have appeared in Google News stories, and in which geographic regions people have searched for them most.

To access the service, go to:
http://www.google.com/trends

To read more about Google Trends, go to:
http://www.google.com/intl/en/trends/about.html