This is my brand new project: http://metrics11.com/ It helps you find profitable keywords niches you can use on your site to get free traffic from Google.
It shows you how many people search for given term per month in chosen country, what is competition for that term, and other metrics like trends or domains availability.
We focus mostly on competitors metrics. I think it is the most comprehensive keyword research tool on the market right now. Try the demo on the front page. What do you think about it?