A fairly new addition to “Google Labs” is “Google Trends.”
Google Trends monitors search volume and news reference volume on specific keyword searches. Using Google trends, you can monitor keywords for long-term growth and declines, and you can spot seasonality trends. You can also compare the popularity of two keywords to gain insight into the relative popularity of each.
According to Google trends, Yahoo is more popular than Google! Check it out (Yahoo is Orange, Google is blue):
Try it for yourself, here.