my fav. search engine tool

http://www.google.com/insights/search/

http://www.google.com/zeitgeist

http://www.google.com/trends

https://adwords.google.com/select/KeywordToolExternal

feedjit.com

trendsengine.info

http://en.bloglue.jp/

http://www.sitestool.com/Widget/2.html