In SEO BOOK Keyword tool it shows 120 monthly searches - so similar to Wordtracker...
And then comes Adwords keyword tool. I make sure to select the [EXACT] search and it gives me... 15,000 monthly searches!
Now, 100 vs 15,000 - there is a big difference, so I really do not know who to trust. I really wish Google's tool is the one... but I really don't know.