10 keyword research tool

https://adwords.google.com/select/KeywordToolExternal
http://www.google.com/sktool/
http://tools.seobook.com/keyword-list/generator.php
http://freekeywords.wordtracker.com/
http://www.goodkeywords.com/good-keywords/
http://www.google.com/insights/search/#
http://www.seomoz.org/popular-searches/index/2010-07-16
http://webconfs.com/keyword-playground.php
http://www.keyworddiscovery.com/search.html
http://www.google.com/trends
http://www.nichebotclassic.com/