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1) What tool do you use that gives you a number of searches per month (not google's broad estimates, ex.: "very low", "low", e.t.c)
2) Someone wrote this here
You can try wordtracker.com
I think if you actually subscribe to the service they will give you google's numbers.
Can anyone confirm that?
That was also covered to a degree (but not completely) in this recent thread [webmasterworld.com...]
Try running a Google AdWords campaign
Do you know how accurate are the statistics shown in Yahoo! Search Marketing? (they have a similar tool to Adwords and it shows an actual amount of monthly searches)
Here is a theory:
For example the monthly searches for the word 'widget' in Overtures tool gives 2,400 searches. Double of that amount would be roughly the Google's monthly searches for 'Widget' which is 4,800.
Now you take that number and compare it with the Adwords tools'
"monthly search estimates" (ex.: 0.6)
If you do it for a large amount of Keywords may be you can actually determine what those Adwords' numbers mean.
Make sense, right?...
(took me 20 minutes to formulate this theory in the most comprehensible way, hope someone answers)