Would like your comments on the following keyword tools: http://www.google.com/trends and https://adwords.google.com/select/KeywordToolExternal would like to get any tips on how accurate they are. since those stats are directly from google, it's the best tools around i think. -overture, un updated stats -word tracker, can't generate real stats by 2% market share, it's just not realistic.
All the available tools will return slightly different results, so it's best to use a combination of them along with using your gut instincts.
No tool will give you EXACT search numbers unless you're running a paid search campaign. Use the keyword research tools mainly to compare relative search frequency between keywords. i.e. - deciding which keyword is best to optimize a page for.