In past two days both Google and Yahoo has announced the most popluar searches. Both Search engines have separate criteria for selecting the most popular searches.
According To yahoo
"To come up with the Top Trends of 2007, we analyze search queries based on a number of factors, including absolute volume and growth versus previous periods, to see which themes and trends bubble to the surface. And of course, individual users and their searches remain anonymous."
Here are the top searches in yahoo for 2007. They like it in a categorized way LINK
Since Google prefer the Video Way, here are the Google Top Searches as per TechCrunch. You can watch VP of Search and User Experience Marissa Mayer Of Google revealed the “fastest rising U.S. search terms” here. LINK
6. club penguin
10. anna nicole smith
And here are some Predictions that were made for 2007. Compare them with those trends by yahoo and Google and look for yourself how interesting it is
2007 Predictions by Mashable LINK
2007 Predictions by ReadWriteWeb LINK