I do not agree that Google Adwords Keyword Tool is the most accurate. Google's actual searches change so much that their estimates are actually way off. This makes sense too because its FREE. If Google gave you the most accurate results, it would not be free. That being said, in my experience I like MNF, Micro Niche Finder, as a general tool because of the domain availability feature and the fact that they attempt to give some kind of competition analysis and measure of backlinks for keyword terms, but it also bases its search results off Google's search results, which makes that part of the tool just as inaccurate as Google's. So I have to say that the paid version of Market Samurai is hands down the most accurate tool out there. But if we are talking about only free tools here, then yea, stick with Google's Keyword Tool. When youre ready for paid, you won't go wrong with Market Samarai.