I have been trying to find out where the data from overture comes from and wordtracker. They do get them from some search engines, just would like to know
Also these others tools interested in knowing, do they all get the data from the same search engines.
inventory.overture.com
wordtracker.com
goodkeywords.com
tools.seobook.com/general/keyword
eomoz.org/tools/kwtool.php
mikes-marketing-tools.com/keywords
http://www.how-to-earn-extra-money.com/ ... earch.html
http://www.keywordelite.com
http://www.wordze.com/
googlekeywords.com