I wrote about the most searched keywords according to Yahoo! a couple of week ago. Google Zeitgeist, has a different story:

A very nice welcome to the newcomers to the list (top gainers): 1. Myspace, 2. Ares, 3. Baidu, 4. wikipedia, 5. orkut, and 6. iTunes

I personally think the annual top gainers results are more valuable and more interesting.