JustinBelle - 8:36 pm on Dec 5, 2011 (gmt 0)
I like very much Google Insights, because I can see if there is any trend and any fluctations of the volume of specific keywords. Also, I use Google Adwords Key Tool.
I am searching for group of terms that I will use as the primary keywords for a new website. For example: "casio sport watches". I search for niches that can bring me sufficient traffic, but with not a strong competition.