Keyword discovery is withut doubt the best keyword research tool opn the market. I personally know David who is CEO of Trellian who produce KD (as well as other tools), and he is a superbly clever guy. I have known him now for many years via Jill Whalen @ high rankings.
BUT, when I research, I use KWD, word tracker, adwords, overture's tool (via API) and then combine them all, compare them all, and live test them piece meal.
NEVER rely on one tool, ESPECIALLY not overture data as it is the most flawed in the industry.
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