Google Trends
Well this is something new from the google labs. You can see how many people search the same things as you do. all you have to do is go
enter atleast two keywords and the query will display as to who many ppl have searched for the similar keywords. you can compare a maximum of five keywords. it just shows a graphical representation doesnt give any solid numbers though.
you can read more abt it here http://www.google.com/trends/about.html
