Wordtracker -
Keyword services for professional search engine optimization
No other keyword analysis software comes even close to wordtracker. Tells you the best keywords related to your site, best keywords that are easiest to get a ranking for and much more.
There is another, and more costly way. You sign up for a Google adwords campaign and bid for keywords ( meaning you spend money ), and find out which keywords cost the most. So now you know which are the best keywords.
