To access Zeitgeist it takes more than number crunching with Google. However, from time to time I look at Google figures – in case I missed something - at
Google Zeitgeist
Search patterns, trends, and surprises according to Google
It is not really "according to Google", but according to what (mostly) people look for with help of Google. And I admit, often I find, I missed something (and more often, I think, I do not miss what I have missed).
You can look at Google's Zeitgeist this by weeks, months and years (back to 2001) and now actual, Google has published their "2005 Year-End Google Zeitgeist" . Besides
Google News - Top Searches in 2005
Froogle - Top Searches in 2005
Google.com - Top Gainers of 2005
1. Myspace
2. Ares
3. Baidu
4. wikipedia
5. orkut
6. iTunes
7. Sky News
8. World of Warcraft
9. Green Day
10. Leonardo da Vinci
Google Zeitgeist looks at World Affairs, Nature, Movies, Celebrities and Phenomena , here!