Does the Google keyword tool give the correct traffic volumes? To use the Google keyword tool you need to know exactly what you are doing. I always click the exact match option to say how many people are looking for the keyword alone. If you head over to Google Insights you can gauge some useful info there. You can see the rising keyword trends over the last 6 years, or you can narrow it down to the last 12 months. Insights doesn’t give exact figures but shows the level of interest in a keyword over time and over particular geographical areas.
Pay attention to the rising keyword stats if you put in several keywords initially to check. You can uncover new keywords related to your business here.
Another option is to use the Free Wordtracker Tool. It gives the daily search volumes of keywords.
But probably the best way to check the true volumes of a keyword and test how visitors respond to your site and the commerciality of that keyword, is by running an adwords campaign. Make sure to leave the content network off, as you only want to test the organic seo results. This is fantastic for testing out new keywords and your site before you rush headlong into a 12 months seo campaign.