A free keyword tool you can try is Chris Baker and Don Shiverdecker’s tool at Good Free Keyword tool. This keyword tool gives you a number of different keyword related data, such as number of Google ads, Number of Overture Searches, and number of books on that keyword and all from the same page.

There’s not much more I can say about it - except try it and see if it works for you. I’ve bookmarked it for regular use. It’s quick, easy and pretty cool.

P.S

Once you have the keywords, you can populate your site with keyword rich articles. A quick and easy way to do that is to use a software tool, such as Article Miner.