I am about to start a new job wihich will involve some basic SEO. I was wondering if someone could explain to me why the search volume results for keywords, differ so wildly between the free Wordtracker keyword tool and the Google tool. I am currently trying to research some keywords for a company which deals with foreign currency conversion(high competition) and I am looking for some long tail keywords. When I find a phrase using Google which looks like it might be worth pursuing, I put it into Wordtracker and there is minimal or no search volume? I have also found that when using the Adwords tool sometimes it states that the competition is high yet when I use the allintitle:"" function there doesn`t seem to be too many pages optimising for that phrase? It would be appreciated if someone experienced could offer their thoughts and perhaps whether it would be better to pay for a subscription of to use the free tools available?