Most searched keyword on internet?

Everyday people across the world do millions of searches on the most populous search engines like google, yahoo, etc. What for they are making / doing searches? There are two kind of searches made, the first one is a general search about information related to products, status of any process, hunting for home, etc. The other one is particular about search words. People who are particular to develop their site or blog hunt for most searched / most popular words. A question may arise to person who learns about keyword hunters like….

1. Is it possible to know which is the most searched word on the internet is?

2. What is the most searched word in US, Europe, Japan, India, etc?

3. Some people especially search the most popular word on internet and put in their site to make their site the most popular on internet…..

There are many queries, etc about the most searched word. But, how to get or analyze the most searched word. I came across some of the sites which give the answers. Google Trends allows tapping into google database of searches to see what is popular and gives results with multiple comparisons of each term. Google Zeitgeist is one which gives information and its associated specialty of what people are searching.

The above two is the most popular to my experience. Others are AOL HOT Searches, ASK IQ, Dogpile Searchspy, Lycos 50, MSN Search Insider, Yahoo Buzz Index, Google Adwords Keywords Tool, Yahoo Keywords Selector Tool, etc.