Here’s an article about HitTail that needs more attention:
Say for example you want to get away from the clutches of PPC advertising, the first thing you should know is how people are finding your website online. Hittail does this, records the frequency, the keywords, the time of the search, the country and much more. In addition in the click of a button, you can have it suggest new terms for your to optimize for your business based on the results gathered from the live statistics.
They also have this other article about Organic SEO and Low Hanging Fruit or PPC, Which is Better?