Web users perform billions of searches every year, leaving the folks at Google with a fount of interesting information. When the year ends, GOOG rounds it all up into their yearly zeitgeist. This year, Twitter and Michael Jackson lead the way.

A bit more about how Google puts their zeitgeist together:

To compile the 2009 Year-End Zeitgeist, we studied the aggregation of billions of queries people typed into Google search this year. We use data from multiple sources, including Insights for Search, Google Trends and internal data tools. We also filter out spam and repeat queries to build out lists that best reflect “the spirit of the times.” All of the search queries we studied are anonymous-no personal information was used.

The Google Zeitgeist always provides an interesting overview of what was on our minds in any given year, so give it a look and share what interesting finds you can dig up in the comments.